Merge pull request #3895 from thinkyhead/rc_singlenozzle_part_2

SINGLENOZZLE: EXTRUDERS versus HOTENDS

Marlin/Conditionals.h

@@ -536,6 +536,21 @@
   #define HAS_PID_FOR_BOTH (ENABLED(PIDTEMP) && ENABLED(PIDTEMPBED))
 
   /**
+   * SINGLENOZZLE needs to differentiate EXTRUDERS and HOTENDS
+   * And all "extruders" are in the same place.
+   */
+  #if ENABLED(SINGLENOZZLE)
+    #define HOTENDS 1
+    #undef TEMP_SENSOR_1_AS_REDUNDANT
+    #undef HOTEND_OFFSET_X
+    #undef HOTEND_OFFSET_Y
+    #define HOTEND_OFFSET_X { 0 }
+    #define HOTEND_OFFSET_Y { 0 }
+  #else
+    #define HOTENDS EXTRUDERS
+  #endif
+
+  /**
    * ARRAY_BY_EXTRUDERS based on EXTRUDERS
    */
   #if EXTRUDERS > 3
@@ -551,15 +566,20 @@
   #define ARRAY_BY_EXTRUDERS1(v1) ARRAY_BY_EXTRUDERS(v1, v1, v1, v1)
 
   /**
-   * With SINGLENOZZLE all "extruders" are in the same place
+   * ARRAY_BY_HOTENDS based on HOTENDS
    */
-  #if ENABLED(SINGLENOZZLE)
-    #undef EXTRUDER_OFFSET_X
-    #undef EXTRUDER_OFFSET_Y
-    #define EXTRUDER_OFFSET_X { 0 }
-    #define EXTRUDER_OFFSET_Y { 0 }
+  #if HOTENDS > 3
+    #define ARRAY_BY_HOTENDS(v1, v2, v3, v4) { v1, v2, v3, v4 }
+  #elif HOTENDS > 2
+    #define ARRAY_BY_HOTENDS(v1, v2, v3, v4) { v1, v2, v3 }
+  #elif HOTENDS > 1
+    #define ARRAY_BY_HOTENDS(v1, v2, v3, v4) { v1, v2 }
+  #else
+    #define ARRAY_BY_HOTENDS(v1, v2, v3, v4) { v1 }
   #endif
 
+  #define ARRAY_BY_HOTENDS1(v1) ARRAY_BY_HOTENDS(v1, v1, v1, v1)
+
   /**
    * Z_DUAL_ENDSTOPS endstop reassignment
    */
@@ -695,11 +715,11 @@
    * Helper Macros for heaters and extruder fan
    */
   #define WRITE_HEATER_0P(v) WRITE(HEATER_0_PIN, v)
-  #if EXTRUDERS > 1 || ENABLED(HEATERS_PARALLEL)
+  #if HOTENDS > 1 || ENABLED(HEATERS_PARALLEL)
     #define WRITE_HEATER_1(v) WRITE(HEATER_1_PIN, v)
-    #if EXTRUDERS > 2
+    #if HOTENDS > 2
       #define WRITE_HEATER_2(v) WRITE(HEATER_2_PIN, v)
-      #if EXTRUDERS > 3
+      #if HOTENDS > 3
         #define WRITE_HEATER_3(v) WRITE(HEATER_3_PIN, v)
       #endif
     #endif

Marlin/Configuration.h

@@ -126,8 +126,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -224,8 +224,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -241,8 +241,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/Configuration_adv.h

@@ -237,7 +237,7 @@
   #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
   #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
   #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the EXTRUDER_OFFSET_X value for the second extruder provides a software
+      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
       // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
       // without modifying the firmware (through the "M218 T1 X???" command).
       // Remember: you should set the second extruder x-offset to 0 in your slicer.

Marlin/Marlin_main.cpp

@@ -356,16 +356,16 @@ static uint8_t target_extruder;
 #endif
 
 // Extruder offsets
-#if EXTRUDERS > 1
-  #ifndef EXTRUDER_OFFSET_X
-    #define EXTRUDER_OFFSET_X { 0 } // X offsets for each extruder
+#if HOTENDS > 1
+  #ifndef HOTEND_OFFSET_X
+    #define HOTEND_OFFSET_X { 0 } // X offsets for each extruder
   #endif
-  #ifndef EXTRUDER_OFFSET_Y
-    #define EXTRUDER_OFFSET_Y { 0 } // Y offsets for each extruder
+  #ifndef HOTEND_OFFSET_Y
+    #define HOTEND_OFFSET_Y { 0 } // Y offsets for each extruder
   #endif
-  float extruder_offset[][EXTRUDERS] = {
-    EXTRUDER_OFFSET_X,
-    EXTRUDER_OFFSET_Y
+  float hotend_offset[][HOTENDS] = {
+    HOTEND_OFFSET_X,
+    HOTEND_OFFSET_Y
     #if ENABLED(DUAL_X_CARRIAGE)
       , { 0 } // Z offsets for each extruder
     #endif
@@ -1249,7 +1249,7 @@ XYZ_CONSTS_FROM_CONFIG(signed char, home_dir, HOME_DIR);
        * This allow soft recalibration of the second extruder offset position
        * without firmware reflash (through the M218 command).
        */
-      return (extruder_offset[X_AXIS][1] > 0) ? extruder_offset[X_AXIS][1] : X2_HOME_POS;
+      return (hotend_offset[X_AXIS][1] > 0) ? hotend_offset[X_AXIS][1] : X2_HOME_POS;
   }
 
   static int x_home_dir(int extruder) {
@@ -1280,7 +1280,7 @@ static void update_software_endstops(AxisEnum axis) {
 
   #if ENABLED(DUAL_X_CARRIAGE)
     if (axis == X_AXIS) {
-      float dual_max_x = max(extruder_offset[X_AXIS][1], X2_MAX_POS);
+      float dual_max_x = max(hotend_offset[X_AXIS][1], X2_MAX_POS);
       if (active_extruder != 0) {
         sw_endstop_min[X_AXIS] = X2_MIN_POS + offs;
         sw_endstop_max[X_AXIS] = dual_max_x + offs;
@@ -4400,6 +4400,10 @@ inline void gcode_M104() {
   if (get_target_extruder_from_command(104)) return;
   if (DEBUGGING(DRYRUN)) return;
 
+  #if ENABLED(SINGLENOZZLE)
+    if (target_extruder != active_extruder) return;
+  #endif
+
   if (code_seen('S')) {
     float temp = code_value();
     thermalManager.setTargetHotend(temp, target_extruder);
@@ -4445,8 +4449,8 @@ inline void gcode_M104() {
       SERIAL_PROTOCOLPGM(" /");
       SERIAL_PROTOCOL_F(thermalManager.degTargetBed(), 1);
     #endif
-    #if EXTRUDERS > 1
-      for (int8_t e = 0; e < EXTRUDERS; ++e) {
+    #if HOTENDS > 1
+      for (int8_t e = 0; e < HOTENDS; ++e) {
         SERIAL_PROTOCOLPGM(" T");
         SERIAL_PROTOCOL(e);
         SERIAL_PROTOCOLCHAR(':');
@@ -4471,8 +4475,8 @@ inline void gcode_M104() {
     #else
       SERIAL_PROTOCOL(thermalManager.getHeaterPower(target_extruder));
     #endif
-    #if EXTRUDERS > 1
-      for (int8_t e = 0; e < EXTRUDERS; ++e) {
+    #if HOTENDS > 1
+      for (int8_t e = 0; e < HOTENDS; ++e) {
         SERIAL_PROTOCOLPGM(" @");
         SERIAL_PROTOCOL(e);
         SERIAL_PROTOCOLCHAR(':');
@@ -4491,13 +4495,13 @@ inline void gcode_M104() {
         SERIAL_PROTOCOLPGM("C->");
         SERIAL_PROTOCOL_F(thermalManager.rawBedTemp() / OVERSAMPLENR, 0);
       #endif
-      for (int8_t cur_extruder = 0; cur_extruder < EXTRUDERS; ++cur_extruder) {
+      for (int8_t cur_hotend = 0; cur_hotend < HOTENDS; ++cur_hotend) {
         SERIAL_PROTOCOLPGM("  T");
-        SERIAL_PROTOCOL(cur_extruder);
+        SERIAL_PROTOCOL(cur_hotend);
         SERIAL_PROTOCOLCHAR(':');
-        SERIAL_PROTOCOL_F(thermalManager.degHotend(cur_extruder), 1);
+        SERIAL_PROTOCOL_F(thermalManager.degHotend(cur_hotend), 1);
         SERIAL_PROTOCOLPGM("C->");
-        SERIAL_PROTOCOL_F(thermalManager.rawHotendTemp(cur_extruder) / OVERSAMPLENR, 0);
+        SERIAL_PROTOCOL_F(thermalManager.rawHotendTemp(cur_hotend) / OVERSAMPLENR, 0);
       }
     #endif
   }
@@ -4554,6 +4558,10 @@ inline void gcode_M109() {
   if (get_target_extruder_from_command(109)) return;
   if (DEBUGGING(DRYRUN)) return;
 
+  #if ENABLED(SINGLENOZZLE)
+    if (target_extruder != active_extruder) return;
+  #endif
+
   bool no_wait_for_cooling = code_seen('S');
   if (no_wait_for_cooling || code_seen('R')) {
     float temp = code_value();
@@ -5429,7 +5437,7 @@ inline void gcode_M206() {
 
 #endif // FWRETRACT
 
-#if EXTRUDERS > 1
+#if HOTENDS > 1
 
   /**
    * M218 - set hotend offset (in mm)
@@ -5442,29 +5450,29 @@ inline void gcode_M206() {
   inline void gcode_M218() {
     if (get_target_extruder_from_command(218)) return;
 
-    if (code_seen('X')) extruder_offset[X_AXIS][target_extruder] = code_value();
-    if (code_seen('Y')) extruder_offset[Y_AXIS][target_extruder] = code_value();
+    if (code_seen('X')) hotend_offset[X_AXIS][target_extruder] = code_value();
+    if (code_seen('Y')) hotend_offset[Y_AXIS][target_extruder] = code_value();
 
     #if ENABLED(DUAL_X_CARRIAGE)
-      if (code_seen('Z')) extruder_offset[Z_AXIS][target_extruder] = code_value();
+      if (code_seen('Z')) hotend_offset[Z_AXIS][target_extruder] = code_value();
     #endif
 
     SERIAL_ECHO_START;
     SERIAL_ECHOPGM(MSG_HOTEND_OFFSET);
-    for (int e = 0; e < EXTRUDERS; e++) {
+    for (int e = 0; e < HOTENDS; e++) {
       SERIAL_CHAR(' ');
-      SERIAL_ECHO(extruder_offset[X_AXIS][e]);
+      SERIAL_ECHO(hotend_offset[X_AXIS][e]);
       SERIAL_CHAR(',');
-      SERIAL_ECHO(extruder_offset[Y_AXIS][e]);
+      SERIAL_ECHO(hotend_offset[Y_AXIS][e]);
       #if ENABLED(DUAL_X_CARRIAGE)
         SERIAL_CHAR(',');
-        SERIAL_ECHO(extruder_offset[Z_AXIS][e]);
+        SERIAL_ECHO(hotend_offset[Z_AXIS][e]);
       #endif
     }
     SERIAL_EOL;
   }
 
-#endif // EXTRUDERS > 1
+#endif // HOTENDS > 1
 
 /**
  * M220: Set speed percentage factor, aka "Feed Rate" (M220 S95)
@@ -5594,7 +5602,7 @@ inline void gcode_M226() {
     // default behaviour (omitting E parameter) is to update for extruder 0 only
     int e = code_seen('E') ? code_value() : 0; // extruder being updated
 
-    if (e < EXTRUDERS) { // catch bad input value
+    if (e < HOTENDS) { // catch bad input value
       if (code_seen('P')) PID_PARAM(Kp, e) = code_value();
       if (code_seen('I')) PID_PARAM(Ki, e) = scalePID_i(code_value());
       if (code_seen('D')) PID_PARAM(Kd, e) = scalePID_d(code_value());
@@ -5606,10 +5614,10 @@ inline void gcode_M226() {
 
       thermalManager.updatePID();
       SERIAL_ECHO_START;
-      #if ENABLED(PID_PARAMS_PER_EXTRUDER)
+      #if ENABLED(PID_PARAMS_PER_HOTEND)
         SERIAL_ECHO(" e:"); // specify extruder in serial output
         SERIAL_ECHO(e);
-      #endif // PID_PARAMS_PER_EXTRUDER
+      #endif // PID_PARAMS_PER_HOTEND
       SERIAL_ECHO(" p:");
       SERIAL_ECHO(PID_PARAM(Kp, e));
       SERIAL_ECHO(" i:");
@@ -5728,7 +5736,7 @@ inline void gcode_M303() {
 
     float temp = code_seen('S') ? code_value() : (e < 0 ? 70.0 : 150.0);
 
-    if (e >= 0 && e < EXTRUDERS)
+    if (e >= 0 && e < HOTENDS)
       target_extruder = e;
 
     KEEPALIVE_STATE(NOT_BUSY); // don't send "busy: processing" messages during autotune output
@@ -6310,13 +6318,13 @@ inline void gcode_M503() {
         SERIAL_ECHO_START;
         SERIAL_ECHOPGM(MSG_HOTEND_OFFSET);
         SERIAL_CHAR(' ');
-        SERIAL_ECHO(extruder_offset[X_AXIS][0]);
+        SERIAL_ECHO(hotend_offset[X_AXIS][0]);
         SERIAL_CHAR(',');
-        SERIAL_ECHO(extruder_offset[Y_AXIS][0]);
+        SERIAL_ECHO(hotend_offset[Y_AXIS][0]);
         SERIAL_CHAR(' ');
         SERIAL_ECHO(duplicate_extruder_x_offset);
         SERIAL_CHAR(',');
-        SERIAL_ECHOLN(extruder_offset[Y_AXIS][1]);
+        SERIAL_ECHOLN(hotend_offset[Y_AXIS][1]);
         break;
       case DXC_FULL_CONTROL_MODE:
       case DXC_AUTO_PARK_MODE:
@@ -6474,7 +6482,7 @@ inline void gcode_T(uint8_t tmp_extruder) {
     #endif
   }
 
-  #if EXTRUDERS > 1
+  #if HOTENDS > 1
     if (tmp_extruder != active_extruder) {
       // Save current position to return to after applying extruder offset
       set_destination_to_current();
@@ -6492,8 +6500,8 @@ inline void gcode_T(uint8_t tmp_extruder) {
         }
 
         // apply Y & Z extruder offset (x offset is already used in determining home pos)
-        current_position[Y_AXIS] -= extruder_offset[Y_AXIS][active_extruder] - extruder_offset[Y_AXIS][tmp_extruder];
-        current_position[Z_AXIS] -= extruder_offset[Z_AXIS][active_extruder] - extruder_offset[Z_AXIS][tmp_extruder];
+        current_position[Y_AXIS] -= hotend_offset[Y_AXIS][active_extruder] - hotend_offset[Y_AXIS][tmp_extruder];
+        current_position[Z_AXIS] -= hotend_offset[Z_AXIS][active_extruder] - hotend_offset[Z_AXIS][tmp_extruder];
         active_extruder = tmp_extruder;
 
         // This function resets the max/min values - the current position may be overwritten below.
@@ -6523,11 +6531,11 @@ inline void gcode_T(uint8_t tmp_extruder) {
       #else // !DUAL_X_CARRIAGE
         #if ENABLED(AUTO_BED_LEVELING_FEATURE)
           // Offset extruder, make sure to apply the bed level rotation matrix
-          vector_3 tmp_offset_vec = vector_3(extruder_offset[X_AXIS][tmp_extruder],
-                                             extruder_offset[Y_AXIS][tmp_extruder],
+          vector_3 tmp_offset_vec = vector_3(hotend_offset[X_AXIS][tmp_extruder],
+                                             hotend_offset[Y_AXIS][tmp_extruder],
                                              0),
-                   act_offset_vec = vector_3(extruder_offset[X_AXIS][active_extruder],
-                                             extruder_offset[Y_AXIS][active_extruder],
+                   act_offset_vec = vector_3(hotend_offset[X_AXIS][active_extruder],
+                                             hotend_offset[Y_AXIS][active_extruder],
                                              0),
                    offset_vec = tmp_offset_vec - act_offset_vec;
 
@@ -6559,7 +6567,7 @@ inline void gcode_T(uint8_t tmp_extruder) {
 
           // The newly-selected extruder is actually at...
           for (int i=X_AXIS; i<=Y_AXIS; i++) {
-            float diff = extruder_offset[i][tmp_extruder] - extruder_offset[i][active_extruder];
+            float diff = hotend_offset[i][tmp_extruder] - hotend_offset[i][active_extruder];
             current_position[i] += diff;
             position_shift[i] += diff; // Offset the coordinate space
             update_software_endstops((AxisEnum)i);
@@ -6590,7 +6598,7 @@ inline void gcode_T(uint8_t tmp_extruder) {
       enable_solenoid_on_active_extruder();
     #endif // EXT_SOLENOID
 
-  #endif // EXTRUDERS > 1
+  #endif // HOTENDS > 1
 
   feedrate = stored_feedrate;
 
@@ -7021,7 +7029,7 @@ void process_next_command() {
           break;
       #endif // FWRETRACT
 
-      #if EXTRUDERS > 1
+      #if HOTENDS > 1
         case 218: // M218 - set hotend offset (in mm), T<extruder_number> X<offset_on_X> Y<offset_on_Y>
           gcode_M218();
           break;
@@ -7891,8 +7899,8 @@ void prepare_move() {
     float max_temp = 0.0;
     if (ELAPSED(millis(), next_status_led_update_ms)) {
       next_status_led_update_ms += 500; // Update every 0.5s
-      for (int8_t cur_extruder = 0; cur_extruder < EXTRUDERS; ++cur_extruder)
-        max_temp = max(max(max_temp, thermalManager.degHotend(cur_extruder)), thermalManager.degTargetHotend(cur_extruder));
+      for (int8_t cur_hotend = 0; cur_hotend < HOTENDS; ++cur_hotend)
+        max_temp = max(max(max_temp, thermalManager.degHotend(cur_hotend)), thermalManager.degTargetHotend(cur_hotend));
       #if HAS_TEMP_BED
         max_temp = max(max(max_temp, thermalManager.degTargetBed()), thermalManager.degBed());
       #endif

Marlin/SanityCheck.h

@@ -468,39 +468,45 @@
 /**
  * Test Heater, Temp Sensor, and Extruder Pins; Sensor Type must also be set.
  */
-#if EXTRUDERS > 3
-  #if TEMP_SENSOR_3 == 0
-    #error "TEMP_SENSOR_3 is required with 4 EXTRUDERS."
-  #elif !HAS_HEATER_3
-    #error "HEATER_3_PIN not defined for this board."
-  #elif !PIN_EXISTS(TEMP_3)
-    #error "TEMP_3_PIN not defined for this board."
-  #elif !PIN_EXISTS(E3_STEP) || !PIN_EXISTS(E3_DIR) || !PIN_EXISTS(E3_ENABLE)
-    #error "E3_STEP_PIN, E3_DIR_PIN, or E3_ENABLE_PIN not defined for this board."
-  #endif
-#elif EXTRUDERS > 2
-  #if TEMP_SENSOR_2 == 0
-    #error "TEMP_SENSOR_2 is required with 3 or more EXTRUDERS."
-  #elif !HAS_HEATER_2
-    #error "HEATER_2_PIN not defined for this board."
-  #elif !PIN_EXISTS(TEMP_2)
-    #error "TEMP_2_PIN not defined for this board."
-  #elif !PIN_EXISTS(E2_STEP) || !PIN_EXISTS(E2_DIR) || !PIN_EXISTS(E2_ENABLE)
-    #error "E2_STEP_PIN, E2_DIR_PIN, or E2_ENABLE_PIN not defined for this board."
+#if !HAS_HEATER_0
+  #error "HEATER_0_PIN not defined for this board."
+#elif !PIN_EXISTS(TEMP_0)
+  #error "TEMP_0_PIN not defined for this board."
+#elif !PIN_EXISTS(E0_STEP) || !PIN_EXISTS(E0_DIR) || !PIN_EXISTS(E0_ENABLE)
+  #error "E0_STEP_PIN, E0_DIR_PIN, or E0_ENABLE_PIN not defined for this board."
+#elif TEMP_SENSOR_0 == 0
+  #error "TEMP_SENSOR_0 is required."
+#endif
+
+#if HOTENDS > 1 || ENABLED(HEATERS_PARALLEL)
+  #if !HAS_HEATER_1
+    #error "HEATER_1_PIN not defined for this board."
   #endif
-#elif EXTRUDERS > 1
+#endif
+
+#if HOTENDS > 1
   #if TEMP_SENSOR_1 == 0
-    #error "TEMP_SENSOR_1 is required with 2 or more EXTRUDERS."
+    #error "TEMP_SENSOR_1 is required with 2 or more HOTENDS."
   #elif !PIN_EXISTS(TEMP_1)
     #error "TEMP_1_PIN not defined for this board."
-  #elif !PIN_EXISTS(E1_STEP) || !PIN_EXISTS(E1_DIR) || !PIN_EXISTS(E1_ENABLE)
-    #error "E1_STEP_PIN, E1_DIR_PIN, or E1_ENABLE_PIN not defined for this board."
   #endif
-#endif
-
-#if EXTRUDERS > 1 || ENABLED(HEATERS_PARALLEL)
-  #if !HAS_HEATER_1
-    #error "HEATER_1_PIN not defined for this board."
+  #if HOTENDS > 2
+    #if TEMP_SENSOR_2 == 0
+      #error "TEMP_SENSOR_2 is required with 3 or more HOTENDS."
+    #elif !HAS_HEATER_2
+      #error "HEATER_2_PIN not defined for this board."
+    #elif !PIN_EXISTS(TEMP_2)
+      #error "TEMP_2_PIN not defined for this board."
+    #endif
+    #if HOTENDS > 3
+      #if TEMP_SENSOR_3 == 0
+        #error "TEMP_SENSOR_3 is required with 4 HOTENDS."
+      #elif !HAS_HEATER_3
+        #error "HEATER_3_PIN not defined for this board."
+      #elif !PIN_EXISTS(TEMP_3)
+        #error "TEMP_3_PIN not defined for this board."
+      #endif
+    #endif
   #endif
 #endif
 
@@ -508,14 +514,21 @@
   #error "TEMP_SENSOR_1 is required with TEMP_SENSOR_1_AS_REDUNDANT."
 #endif
 
-#if !HAS_HEATER_0
-  #error "HEATER_0_PIN not defined for this board."
-#elif !PIN_EXISTS(TEMP_0)
-  #error "TEMP_0_PIN not defined for this board."
-#elif !PIN_EXISTS(E0_STEP) || !PIN_EXISTS(E0_DIR) || !PIN_EXISTS(E0_ENABLE)
-  #error "E0_STEP_PIN, E0_DIR_PIN, or E0_ENABLE_PIN not defined for this board."
-#elif TEMP_SENSOR_0 == 0
-  #error "TEMP_SENSOR_0 is required."
+/**
+ * Test Extruder Pins
+ */
+#if EXTRUDERS > 3
+  #if !PIN_EXISTS(E3_STEP) || !PIN_EXISTS(E3_DIR) || !PIN_EXISTS(E3_ENABLE)
+    #error E3_STEP_PIN, E3_DIR_PIN, or E3_ENABLE_PIN not defined for this board.
+  #endif
+#elif EXTRUDERS > 2
+  #if !PIN_EXISTS(E2_STEP) || !PIN_EXISTS(E2_DIR) || !PIN_EXISTS(E2_ENABLE)
+    #error E2_STEP_PIN, E2_DIR_PIN, or E2_ENABLE_PIN not defined for this board.
+  #endif
+#elif EXTRUDERS > 1
+  #if !PIN_EXISTS(E1_STEP) || !PIN_EXISTS(E1_DIR) || !PIN_EXISTS(E1_ENABLE)
+    #error E1_STEP_PIN, E1_DIR_PIN, or E1_ENABLE_PIN not defined for this board.
+  #endif
 #endif
 
 /**
@@ -574,6 +587,12 @@
   #error "Z_DUAL_ENDSTOPS settings are simplified. Just set Z2_USE_ENDSTOP to the endstop you want to repurpose for Z2"
 #elif defined(LANGUAGE_INCLUDE)
   #error "LANGUAGE_INCLUDE has been replaced by LCD_LANGUAGE. Please update your configuration."
+#elif defined(EXTRUDER_OFFSET_X) || defined(EXTRUDER_OFFSET_Y)
+  #error "EXTRUDER_OFFSET_[XY] is deprecated. Use HOTEND_OFFSET_[XY] instead."
+#elif defined(PID_PARAMS_PER_EXTRUDER)
+  #error "PID_PARAMS_PER_EXTRUDER is deprecated. Use PID_PARAMS_PER_HOTEND instead."
+#elif defined(EXTRUDER_WATTS)
+  #error "EXTRUDER_WATTS is deprecated. Use HOTEND_WATTS instead."
 #endif
 
 #endif //SANITYCHECK_H

Marlin/boards.h

@@ -32,17 +32,17 @@
 #define BOARD_CHEAPTRONIC       2    // Cheaptronic v1.0
 #define BOARD_SETHI             20   // Sethi 3D_1
 #define BOARD_RAMPS_OLD         3    // MEGA/RAMPS up to 1.2
-#define BOARD_RAMPS_13_EFB      33   // RAMPS 1.3 (Power outputs: Extruder, Fan, Bed)
-#define BOARD_RAMPS_13_EEB      34   // RAMPS 1.3 (Power outputs: Extruder0, Extruder1, Bed)
-#define BOARD_RAMPS_13_EFF      35   // RAMPS 1.3 (Power outputs: Extruder, Fan, Fan)
-#define BOARD_RAMPS_13_EEF      36   // RAMPS 1.3 (Power outputs: Extruder0, Extruder1, Fan)
+#define BOARD_RAMPS_13_EFB      33   // RAMPS 1.3 (Power outputs: Hotend, Fan, Bed)
+#define BOARD_RAMPS_13_EEB      34   // RAMPS 1.3 (Power outputs: Hotend0, Hotend1, Bed)
+#define BOARD_RAMPS_13_EFF      35   // RAMPS 1.3 (Power outputs: Hotend, Fan0, Fan1)
+#define BOARD_RAMPS_13_EEF      36   // RAMPS 1.3 (Power outputs: Hotend0, Hotend1, Fan)
 #define BOARD_RAMPS_13_SF       38   // RAMPS 1.3 (Power outputs: Spindle, Controller Fan)
 #define BOARD_FELIX2            37   // Felix 2.0+ Electronics Board (RAMPS like)
 #define BOARD_RIGIDBOARD        42   // Invent-A-Part RigidBoard
-#define BOARD_RAMPS_14_EFB      43   // RAMPS 1.4 (Power outputs: Extruder, Fan, Bed)
-#define BOARD_RAMPS_14_EEB      44   // RAMPS 1.4 (Power outputs: Extruder0, Extruder1, Bed)
-#define BOARD_RAMPS_14_EFF      45   // RAMPS 1.4 (Power outputs: Extruder, Fan, Fan)
-#define BOARD_RAMPS_14_EEF      46   // RAMPS 1.4 (Power outputs: Extruder0, Extruder1, Fan)
+#define BOARD_RAMPS_14_EFB      43   // RAMPS 1.4 (Power outputs: Hotend, Fan, Bed)
+#define BOARD_RAMPS_14_EEB      44   // RAMPS 1.4 (Power outputs: Hotend0, Hotend1, Bed)
+#define BOARD_RAMPS_14_EFF      45   // RAMPS 1.4 (Power outputs: Hotend, Fan0, Fan1)
+#define BOARD_RAMPS_14_EEF      46   // RAMPS 1.4 (Power outputs: Hotend0, Hotend1, Fan)
 #define BOARD_RAMPS_14_SF       48   // RAMPS 1.4 (Power outputs: Spindle, Controller Fan)
 #define BOARD_GEN6              5    // Gen6
 #define BOARD_GEN6_DELUXE       51   // Gen6 deluxe

Marlin/configuration_store.cpp

@@ -247,7 +247,7 @@ void Config_StoreSettings()  {
   for (uint8_t e = 0; e < 4; e++) {
 
     #if ENABLED(PIDTEMP)
-      if (e < EXTRUDERS) {
+      if (e < HOTENDS) {
         EEPROM_WRITE_VAR(i, PID_PARAM(Kp, e));
         EEPROM_WRITE_VAR(i, PID_PARAM(Ki, e));
         EEPROM_WRITE_VAR(i, PID_PARAM(Kd, e));
@@ -267,7 +267,7 @@ void Config_StoreSettings()  {
         for (uint8_t q = 3; q--;) EEPROM_WRITE_VAR(i, dummy); // Ki, Kd, Kc
       }
 
-  } // Extruders Loop
+  } // Hotends Loop
 
   #if DISABLED(PID_ADD_EXTRUSION_RATE)
     int lpq_len = 20;
@@ -427,7 +427,7 @@ void Config_RetrieveSettings() {
     #if ENABLED(PIDTEMP)
       for (uint8_t e = 0; e < 4; e++) { // 4 = max extruders currently supported by Marlin
         EEPROM_READ_VAR(i, dummy); // Kp
-        if (e < EXTRUDERS && dummy != DUMMY_PID_VALUE) {
+        if (e < HOTENDS && dummy != DUMMY_PID_VALUE) {
           // do not need to scale PID values as the values in EEPROM are already scaled
           PID_PARAM(Kp, e) = dummy;
           EEPROM_READ_VAR(i, PID_PARAM(Ki, e));
@@ -585,8 +585,8 @@ void Config_ResetDefault() {
   #endif
 
   #if ENABLED(PIDTEMP)
-    #if ENABLED(PID_PARAMS_PER_EXTRUDER)
-      for (uint8_t e = 0; e < EXTRUDERS; e++)
+    #if ENABLED(PID_PARAMS_PER_HOTEND)
+      for (uint8_t e = 0; e < HOTENDS; e++)
     #else
       int e = 0; UNUSED(e); // only need to write once
     #endif
@@ -802,9 +802,9 @@ void Config_PrintSettings(bool forReplay) {
       SERIAL_ECHOLNPGM("PID settings:");
     }
     #if ENABLED(PIDTEMP)
-      #if EXTRUDERS > 1
+      #if HOTENDS > 1
         if (forReplay) {
-          for (uint8_t i = 0; i < EXTRUDERS; i++) {
+          for (uint8_t i = 0; i < HOTENDS; i++) {
             CONFIG_ECHO_START;
             SERIAL_ECHOPAIR("  M301 E", i);
             SERIAL_ECHOPAIR(" P", PID_PARAM(Kp, i));
@@ -818,8 +818,8 @@ void Config_PrintSettings(bool forReplay) {
           }
         }
         else
-      #endif // EXTRUDERS > 1
-      // !forReplay || EXTRUDERS == 1
+      #endif // HOTENDS > 1
+      // !forReplay || HOTENDS == 1
       {
         CONFIG_ECHO_START;
         SERIAL_ECHOPAIR("  M301 P", PID_PARAM(Kp, 0)); // for compatibility with hosts, only echo values for E0

Marlin/dogm_bitmaps.h

@@ -110,7 +110,7 @@
 // be displayed.
 
 #if HAS_TEMP_BED
-  #if EXTRUDERS == 1
+  #if HOTENDS == 1
     #define STATUS_SCREENWIDTH     115 //Width in pixels
     #define STATUS_SCREENHEIGHT     19 //Height in pixels
     #define STATUS_SCREENBYTEWIDTH  15 //Width in bytes
@@ -160,7 +160,7 @@
       0x1E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xFF, 0xFF, 0x80, 0x7F, 0xFF, 0xE0,
       0x0C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xFF, 0xFF, 0x80, 0x00, 0x00, 0x00
     };
-  #elif EXTRUDERS == 2
+  #elif HOTENDS == 2
     #define STATUS_SCREENWIDTH     115 //Width in pixels
     #define STATUS_SCREENHEIGHT     19 //Height in pixels
     #define STATUS_SCREENBYTEWIDTH  15 //Width in bytes
@@ -262,7 +262,7 @@
     };
   #endif // Extruders
 #else
-  #if EXTRUDERS == 1
+  #if HOTENDS == 1
     #define STATUS_SCREENWIDTH     115 //Width in pixels
     #define STATUS_SCREENHEIGHT     19 //Height in pixels
     #define STATUS_SCREENBYTEWIDTH  15 //Width in bytes
@@ -312,7 +312,7 @@
       0x1E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7F, 0xFF, 0xE0,
       0x0C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
     };
-  #elif EXTRUDERS == 2
+  #elif HOTENDS == 2
     #define STATUS_SCREENWIDTH     115 //Width in pixels
     #define STATUS_SCREENHEIGHT     19 //Height in pixels
     #define STATUS_SCREENBYTEWIDTH  15 //Width in bytes

Marlin/dogm_lcd_implementation.h

@@ -370,10 +370,10 @@ static void lcd_implementation_status_screen() {
   #endif
 
   // Extruders
-  for (int i = 0; i < EXTRUDERS; i++) _draw_heater_status(5 + i * 25, i);
+  for (int i = 0; i < HOTENDS; i++) _draw_heater_status(5 + i * 25, i);
 
   // Heated bed
-  #if EXTRUDERS < 4 && HAS_TEMP_BED
+  #if HOTENDS < 4 && HAS_TEMP_BED
     _draw_heater_status(81, -1);
   #endif
 

Marlin/example_configurations/Felix/Configuration.h

@@ -126,8 +126,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -224,8 +224,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -241,8 +241,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/Felix/Configuration_adv.h

@@ -237,7 +237,7 @@
   #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
   #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
   #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the EXTRUDER_OFFSET_X value for the second extruder provides a software
+      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
       // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
       // without modifying the firmware (through the "M218 T1 X???" command).
       // Remember: you should set the second extruder x-offset to 0 in your slicer.

Marlin/example_configurations/Felix/DUAL/Configuration.h

@@ -126,8 +126,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -224,8 +224,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -241,8 +241,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/Hephestos/Configuration.h

@@ -129,8 +129,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -227,8 +227,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -244,8 +244,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/Hephestos/Configuration_adv.h

@@ -237,7 +237,7 @@
   #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
   #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
   #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the EXTRUDER_OFFSET_X value for the second extruder provides a software
+      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
       // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
       // without modifying the firmware (through the "M218 T1 X???" command).
       // Remember: you should set the second extruder x-offset to 0 in your slicer.

Marlin/example_configurations/Hephestos_2/Configuration.h

@@ -126,8 +126,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -224,8 +224,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -241,8 +241,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 250  // If the temperature difference between the target temperature and the actual temperature
                                     // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/Hephestos_2/Configuration_adv.h

@@ -237,7 +237,7 @@
   #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
   #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
   #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the EXTRUDER_OFFSET_X value for the second extruder provides a software
+      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
       // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
       // without modifying the firmware (through the "M218 T1 X???" command).
       // Remember: you should set the second extruder x-offset to 0 in your slicer.

Marlin/example_configurations/K8200/Configuration.h

@@ -133,8 +133,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -231,8 +231,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -248,8 +248,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/K8200/Configuration_adv.h

@@ -243,7 +243,7 @@
   #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
   #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
   #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the EXTRUDER_OFFSET_X value for the second extruder provides a software
+      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
       // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
       // without modifying the firmware (through the "M218 T1 X???" command).
       // Remember: you should set the second extruder x-offset to 0 in your slicer.

Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h

@@ -126,8 +126,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -224,8 +224,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -241,8 +241,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/RigidBot/Configuration.h

@@ -126,8 +126,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-#define EXTRUDER_OFFSET_X {0.0, 36.00} // (in mm) for each extruder, offset of the hotend on the X axis
-#define EXTRUDER_OFFSET_Y {0.0, 0.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+#define HOTEND_OFFSET_X {0.0, 36.00} // (in mm) for each extruder, offset of the hotend on the X axis
+#define HOTEND_OFFSET_Y {0.0, 0.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -224,8 +224,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -241,8 +241,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/RigidBot/Configuration_adv.h

@@ -237,7 +237,7 @@
   #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
   #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
   #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the EXTRUDER_OFFSET_X value for the second extruder provides a software
+      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
       // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
       // without modifying the firmware (through the "M218 T1 X???" command).
       // Remember: you should set the second extruder x-offset to 0 in your slicer.

Marlin/example_configurations/SCARA/Configuration.h

@@ -151,8 +151,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -249,8 +249,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-#define EXTRUDER_WATTS (2*2/5.9)       // P=U^2/R
-#define BED_WATTS (5.45*5.45/2.2)      // P=U^2/R
+#define HOTEND_WATTS (2*2/5.9)       // P=U^2/R
+#define BED_WATTS (5.45*5.45/2.2)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -266,8 +266,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 20 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/SCARA/Configuration_adv.h

@@ -237,7 +237,7 @@
   #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
   #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
   #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the EXTRUDER_OFFSET_X value for the second extruder provides a software
+      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
       // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
       // without modifying the firmware (through the "M218 T1 X???" command).
       // Remember: you should set the second extruder x-offset to 0 in your slicer.

Marlin/example_configurations/TAZ4/Configuration.h

@@ -126,8 +126,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -224,8 +224,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -241,8 +241,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 16 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/TAZ4/Configuration_adv.h

@@ -245,7 +245,7 @@
   #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
   #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
   #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the EXTRUDER_OFFSET_X value for the second extruder provides a software
+      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
       // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
       // without modifying the firmware (through the "M218 T1 X???" command).
       // Remember: you should set the second extruder x-offset to 0 in your slicer.

Marlin/example_configurations/WITBOX/Configuration.h

@@ -129,8 +129,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -227,8 +227,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -244,8 +244,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/WITBOX/Configuration_adv.h

@@ -237,7 +237,7 @@
   #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
   #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
   #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the EXTRUDER_OFFSET_X value for the second extruder provides a software
+      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
       // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
       // without modifying the firmware (through the "M218 T1 X???" command).
       // Remember: you should set the second extruder x-offset to 0 in your slicer.

Marlin/example_configurations/adafruit/ST7565/Configuration.h

@@ -126,8 +126,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -224,8 +224,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -241,8 +241,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/delta/biv2.5/Configuration.h

@@ -126,8 +126,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -224,8 +224,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -241,8 +241,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/delta/biv2.5/Configuration_adv.h

@@ -237,7 +237,7 @@
   #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
   #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
   #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the EXTRUDER_OFFSET_X value for the second extruder provides a software
+      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
       // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
       // without modifying the firmware (through the "M218 T1 X???" command).
       // Remember: you should set the second extruder x-offset to 0 in your slicer.

Marlin/example_configurations/delta/generic/Configuration.h

@@ -126,8 +126,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -224,8 +224,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -241,8 +241,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/delta/generic/Configuration_adv.h

@@ -237,7 +237,7 @@
   #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
   #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
   #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the EXTRUDER_OFFSET_X value for the second extruder provides a software
+      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
       // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
       // without modifying the firmware (through the "M218 T1 X???" command).
       // Remember: you should set the second extruder x-offset to 0 in your slicer.

Marlin/example_configurations/delta/kossel_mini/Configuration.h

@@ -126,8 +126,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -224,8 +224,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -241,8 +241,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h

@@ -237,7 +237,7 @@
   #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
   #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
   #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the EXTRUDER_OFFSET_X value for the second extruder provides a software
+      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
       // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
       // without modifying the firmware (through the "M218 T1 X???" command).
       // Remember: you should set the second extruder x-offset to 0 in your slicer.

Marlin/example_configurations/delta/kossel_pro/Configuration.h

@@ -132,8 +132,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -230,8 +230,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -247,8 +247,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 50 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h

@@ -242,7 +242,7 @@
   #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
   #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
   #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the EXTRUDER_OFFSET_X value for the second extruder provides a software
+      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
       // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
       // without modifying the firmware (through the "M218 T1 X???" command).
       // Remember: you should set the second extruder x-offset to 0 in your slicer.

Marlin/example_configurations/delta/kossel_xl/Configuration.h

@@ -119,8 +119,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -217,8 +217,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -234,8 +234,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h

@@ -237,7 +237,7 @@
   #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
   #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
   #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the EXTRUDER_OFFSET_X value for the second extruder provides a software
+      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
       // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
       // without modifying the firmware (through the "M218 T1 X???" command).
       // Remember: you should set the second extruder x-offset to 0 in your slicer.

Marlin/example_configurations/makibox/Configuration.h

@@ -126,8 +126,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -224,8 +224,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -241,8 +241,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/makibox/Configuration_adv.h

@@ -237,7 +237,7 @@
   #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
   #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
   #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the EXTRUDER_OFFSET_X value for the second extruder provides a software
+      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
       // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
       // without modifying the firmware (through the "M218 T1 X???" command).
       // Remember: you should set the second extruder x-offset to 0 in your slicer.

Marlin/example_configurations/tvrrug/Round2/Configuration.h

@@ -126,8 +126,8 @@
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
 // For the other hotends it is their distance from the extruder 0 hotend.
-//#define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
-//#define EXTRUDER_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
+//#define HOTEND_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
+//#define HOTEND_OFFSET_Y {0.0, 5.00}  // (in mm) for each extruder, offset of the hotend on the Y axis
 
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
@@ -224,8 +224,8 @@
 #define BED_MAXTEMP 150
 
 // If you want the M105 heater power reported in watts, define the BED_WATTS, and (shared for all extruders) EXTRUDER_WATTS
-//#define EXTRUDER_WATTS (12.0*12.0/6.7) // P=U^2/R
-//#define BED_WATTS (12.0*12.0/1.1)      // P=U^2/R
+//#define HOTEND_WATTS (12.0*12.0/6.7) // P=U^2/R
+//#define BED_WATTS (12.0*12.0/1.1)    // P=U^2/R
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -241,8 +241,8 @@
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
   //#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
-  //#define PID_PARAMS_PER_EXTRUDER // Uses separate PID parameters for each extruder (useful for mismatched extruders)
-                                    // Set/get with gcode: M301 E[extruder number, 0-2]
+  //#define PID_PARAMS_PER_HOTEND // Uses separate PID parameters for each extruder (useful for mismatched extruders)
+                                  // Set/get with gcode: M301 E[extruder number, 0-2]
   #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
                                   // is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term

Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h

@@ -237,7 +237,7 @@
   #define X2_MAX_POS 353    // set maximum to the distance between toolheads when both heads are homed
   #define X2_HOME_DIR 1     // the second X-carriage always homes to the maximum endstop position
   #define X2_HOME_POS X2_MAX_POS // default home position is the maximum carriage position
-      // However: In this mode the EXTRUDER_OFFSET_X value for the second extruder provides a software
+      // However: In this mode the HOTEND_OFFSET_X value for the second extruder provides a software
       // override for X2_HOME_POS. This also allow recalibration of the distance between the two endstops
       // without modifying the firmware (through the "M218 T1 X???" command).
       // Remember: you should set the second extruder x-offset to 0 in your slicer.

Marlin/pins.h

@@ -243,20 +243,38 @@
 #define marlinAnalogInputToDigitalPin(p) ((p) == -1 ? -1 : (p) + 0xA0)
 
 // List of pins which to ignore when asked to change by gcode, 0 and 1 are RX and TX, do not mess with those!
-#define _E0_PINS E0_STEP_PIN, E0_DIR_PIN, E0_ENABLE_PIN, E0_MS1_PIN, E0_MS2_PIN, HEATER_0_PIN, EXTRUDER_0_AUTO_FAN_PIN, marlinAnalogInputToDigitalPin(TEMP_0_PIN),
+#define _E0_PINS E0_STEP_PIN, E0_DIR_PIN, E0_ENABLE_PIN, E0_MS1_PIN, E0_MS2_PIN,
 #define _E1_PINS
 #define _E2_PINS
 #define _E3_PINS
 
 #if EXTRUDERS > 1
   #undef _E1_PINS
-  #define _E1_PINS E1_STEP_PIN, E1_DIR_PIN, E1_ENABLE_PIN, HEATER_1_PIN, E1_MS1_PIN, E1_MS2_PIN, EXTRUDER_1_AUTO_FAN_PIN, marlinAnalogInputToDigitalPin(TEMP_1_PIN),
+  #define _E1_PINS E1_STEP_PIN, E1_DIR_PIN, E1_ENABLE_PIN, E1_MS1_PIN, E1_MS2_PIN,
   #if EXTRUDERS > 2
     #undef _E2_PINS
-    #define _E2_PINS E2_STEP_PIN, E2_DIR_PIN, E2_ENABLE_PIN, HEATER_2_PIN, EXTRUDER_2_AUTO_FAN_PIN, marlinAnalogInputToDigitalPin(TEMP_2_PIN),
+    #define _E2_PINS E2_STEP_PIN, E2_DIR_PIN, E2_ENABLE_PIN,
     #if EXTRUDERS > 3
       #undef _E3_PINS
-      #define _E3_PINS E3_STEP_PIN, E3_DIR_PIN, E3_ENABLE_PIN, HEATER_3_PIN, EXTRUDER_3_AUTO_FAN_PIN, marlinAnalogInputToDigitalPin(TEMP_3_PIN),
+      #define _E3_PINS E3_STEP_PIN, E3_DIR_PIN, E3_ENABLE_PIN,
+    #endif
+  #endif
+#endif
+
+#define _H0_PINS HEATER_0_PIN, EXTRUDER_0_AUTO_FAN_PIN, marlinAnalogInputToDigitalPin(TEMP_0_PIN),
+#define _H1_PINS
+#define _H2_PINS
+#define _H3_PINS
+
+#if HOTENDS > 1
+  #undef _H1_PINS
+  #define _H1_PINS HEATER_1_PIN, EXTRUDER_1_AUTO_FAN_PIN, marlinAnalogInputToDigitalPin(TEMP_1_PIN),
+  #if HOTENDS > 2
+    #undef _H2_PINS
+    #define _H2_PINS HEATER_2_PIN, EXTRUDER_2_AUTO_FAN_PIN, marlinAnalogInputToDigitalPin(TEMP_2_PIN),
+    #if HOTENDS > 3
+      #undef _H3_PINS
+      #define _H3_PINS HEATER_3_PIN, EXTRUDER_3_AUTO_FAN_PIN, marlinAnalogInputToDigitalPin(TEMP_3_PIN),
     #endif
   #endif
 #endif
@@ -383,6 +401,7 @@
     Z_STEP_PIN, Z_DIR_PIN, Z_ENABLE_PIN, Z_MIN_PIN, Z_MAX_PIN, Z_MIN_PROBE_PIN, \
     PS_ON_PIN, HEATER_BED_PIN, FAN_PIN, FAN1_PIN, FAN2_PIN, CONTROLLERFAN_PIN, \
     _E0_PINS _E1_PINS _E2_PINS _E3_PINS BED_PINS \
+    _H0_PINS _H1_PINS _H2_PINS _H3_PINS \
     _X2_PINS _Y2_PINS _Z2_PINS \
     X_MS1_PIN, X_MS2_PIN, Y_MS1_PIN, Y_MS2_PIN, Z_MS1_PIN, Z_MS2_PIN \
   }

Marlin/pins_MEGACONTROLLER.h

@@ -28,7 +28,7 @@
   #error "Oops!  Make sure you have 'Arduino Mega' selected from the 'Tools -> Boards' menu."
 #endif
 
-#if EXTRUDERS > 2
+#if EXTRUDERS > 2 || HOTENDS > 2
   #error "Mega Controller supports up to 2 extruders. Comment this line to keep going."
 #endif
 

Marlin/pins_RAMPS_14.h

@@ -25,16 +25,16 @@
  *
  * Applies to the following boards:
  *
- *  RAMPS_14_EFB (Extruder, Fan, Bed)
- *  RAMPS_14_EEB (Extruder, Extruder, Bed)
- *  RAMPS_14_EFF (Extruder, Fan, Fan)
- *  RAMPS_14_EEF (Extruder, Extruder, Fan)
+ *  RAMPS_14_EFB (Hotend, Fan, Bed)
+ *  RAMPS_14_EEB (Hotend0, Hotend1, Bed)
+ *  RAMPS_14_EFF (Hotend, Fan0, Fan1)
+ *  RAMPS_14_EEF (Hotend0, Hotend1, Fan)
  *  RAMPS_14_SF  (Spindle, Controller Fan)
  *
- *  RAMPS_13_EFB (Extruder, Fan, Bed)
- *  RAMPS_13_EEB (Extruder, Extruder, Bed)
- *  RAMPS_13_EFF (Extruder, Fan, Fan)
- *  RAMPS_13_EEF (Extruder, Extruder, Fan)
+ *  RAMPS_13_EFB (Hotend, Fan, Bed)
+ *  RAMPS_13_EEB (Hotend0, Hotend1, Bed)
+ *  RAMPS_13_EFF (Hotend, Fan0, Fan1)
+ *  RAMPS_13_EEF (Hotend0, Hotend1, Fan)
  *  RAMPS_13_SF  (Spindle, Controller Fan)
  *
  *  Other pins_MYBOARD.h files may override these defaults

Marlin/pins_RUMBA.h

@@ -28,7 +28,7 @@
   #error "Oops!  Make sure you have 'Arduino Mega' selected from the 'Tools -> Boards' menu."
 #endif
 
-#if EXTRUDERS > 3
+#if EXTRUDERS > 3 || HOTENDS > 3
   #error "RUMBA supports up to 3 extruders. Comment this line to keep going."
 #endif
 

Marlin/temperature.cpp

@@ -42,17 +42,17 @@
   static void* heater_ttbl_map[2] = {(void*)HEATER_0_TEMPTABLE, (void*)HEATER_1_TEMPTABLE };
   static uint8_t heater_ttbllen_map[2] = { HEATER_0_TEMPTABLE_LEN, HEATER_1_TEMPTABLE_LEN };
 #else
-  static void* heater_ttbl_map[EXTRUDERS] = ARRAY_BY_EXTRUDERS((void*)HEATER_0_TEMPTABLE, (void*)HEATER_1_TEMPTABLE, (void*)HEATER_2_TEMPTABLE, (void*)HEATER_3_TEMPTABLE);
-  static uint8_t heater_ttbllen_map[EXTRUDERS] = ARRAY_BY_EXTRUDERS(HEATER_0_TEMPTABLE_LEN, HEATER_1_TEMPTABLE_LEN, HEATER_2_TEMPTABLE_LEN, HEATER_3_TEMPTABLE_LEN);
+  static void* heater_ttbl_map[HOTENDS] = ARRAY_BY_HOTENDS((void*)HEATER_0_TEMPTABLE, (void*)HEATER_1_TEMPTABLE, (void*)HEATER_2_TEMPTABLE, (void*)HEATER_3_TEMPTABLE);
+  static uint8_t heater_ttbllen_map[HOTENDS] = ARRAY_BY_HOTENDS(HEATER_0_TEMPTABLE_LEN, HEATER_1_TEMPTABLE_LEN, HEATER_2_TEMPTABLE_LEN, HEATER_3_TEMPTABLE_LEN);
 #endif
 
 Temperature thermalManager;
 
 // public:
 
-int Temperature::current_temperature_raw[EXTRUDERS] = { 0 };
-float Temperature::current_temperature[EXTRUDERS] = { 0.0 };
-int Temperature::target_temperature[EXTRUDERS] = { 0 };
+int Temperature::current_temperature_raw[HOTENDS] = { 0 };
+float Temperature::current_temperature[HOTENDS] = { 0.0 };
+int Temperature::target_temperature[HOTENDS] = { 0 };
 
 int Temperature::current_temperature_bed_raw = 0;
 float Temperature::current_temperature_bed = 0.0;
@@ -69,12 +69,12 @@ unsigned char Temperature::soft_pwm_bed;
 #endif
 
 #if ENABLED(PIDTEMP)
-  #if ENABLED(PID_PARAMS_PER_EXTRUDER)
-    float Temperature::Kp[EXTRUDERS] = ARRAY_BY_EXTRUDERS1(DEFAULT_Kp),
-          Temperature::Ki[EXTRUDERS] = ARRAY_BY_EXTRUDERS1((DEFAULT_Ki) * (PID_dT)),
-          Temperature::Kd[EXTRUDERS] = ARRAY_BY_EXTRUDERS1((DEFAULT_Kd) / (PID_dT));
+  #if ENABLED(PID_PARAMS_PER_HOTEND)
+    float Temperature::Kp[HOTENDS] = ARRAY_BY_HOTENDS1(DEFAULT_Kp),
+          Temperature::Ki[HOTENDS] = ARRAY_BY_HOTENDS1((DEFAULT_Ki) * (PID_dT)),
+          Temperature::Kd[HOTENDS] = ARRAY_BY_HOTENDS1((DEFAULT_Kd) / (PID_dT));
     #if ENABLED(PID_ADD_EXTRUSION_RATE)
-      float Temperature::Kc[EXTRUDERS] = ARRAY_BY_EXTRUDERS1(DEFAULT_Kc);
+      float Temperature::Kc[HOTENDS] = ARRAY_BY_HOTENDS1(DEFAULT_Kc);
     #endif
   #else
     float Temperature::Kp = DEFAULT_Kp,
@@ -97,8 +97,8 @@ unsigned char Temperature::soft_pwm_bed;
 #endif
 
 #if ENABLED(THERMAL_PROTECTION_HOTENDS) && WATCH_TEMP_PERIOD > 0
-  int Temperature::watch_target_temp[EXTRUDERS] = { 0 };
-  millis_t Temperature::watch_heater_next_ms[EXTRUDERS] = { 0 };
+  int Temperature::watch_target_temp[HOTENDS] = { 0 };
+  millis_t Temperature::watch_heater_next_ms[HOTENDS] = { 0 };
 #endif
 
 #if ENABLED(THERMAL_PROTECTION_HOTENDS) && WATCH_BED_TEMP_PERIOD > 0
@@ -120,23 +120,23 @@ unsigned char Temperature::soft_pwm_bed;
 volatile bool Temperature::temp_meas_ready = false;
 
 #if ENABLED(PIDTEMP)
-  float Temperature::temp_iState[EXTRUDERS] = { 0 };
-  float Temperature::temp_dState[EXTRUDERS] = { 0 };
-  float Temperature::pTerm[EXTRUDERS];
-  float Temperature::iTerm[EXTRUDERS];
-  float Temperature::dTerm[EXTRUDERS];
+  float Temperature::temp_iState[HOTENDS] = { 0 };
+  float Temperature::temp_dState[HOTENDS] = { 0 };
+  float Temperature::pTerm[HOTENDS];
+  float Temperature::iTerm[HOTENDS];
+  float Temperature::dTerm[HOTENDS];
 
   #if ENABLED(PID_ADD_EXTRUSION_RATE)
-    float Temperature::cTerm[EXTRUDERS];
-    long Temperature::last_position[EXTRUDERS];
+    float Temperature::cTerm[HOTENDS];
+    long Temperature::last_position[HOTENDS];
     long Temperature::lpq[LPQ_MAX_LEN];
     int Temperature::lpq_ptr = 0;
   #endif
 
-  float Temperature::pid_error[EXTRUDERS];
-  float Temperature::temp_iState_min[EXTRUDERS];
-  float Temperature::temp_iState_max[EXTRUDERS];
-  bool Temperature::pid_reset[EXTRUDERS];
+  float Temperature::pid_error[HOTENDS];
+  float Temperature::temp_iState_min[HOTENDS];
+  float Temperature::temp_iState_max[HOTENDS];
+  bool Temperature::pid_reset[HOTENDS];
 #endif
 
 #if ENABLED(PIDTEMPBED)
@@ -156,10 +156,10 @@ unsigned long Temperature::raw_temp_value[4] = { 0 };
 unsigned long Temperature::raw_temp_bed_value = 0;
 
 // Init min and max temp with extreme values to prevent false errors during startup
-int Temperature::minttemp_raw[EXTRUDERS] = ARRAY_BY_EXTRUDERS(HEATER_0_RAW_LO_TEMP , HEATER_1_RAW_LO_TEMP , HEATER_2_RAW_LO_TEMP, HEATER_3_RAW_LO_TEMP);
-int Temperature::maxttemp_raw[EXTRUDERS] = ARRAY_BY_EXTRUDERS(HEATER_0_RAW_HI_TEMP , HEATER_1_RAW_HI_TEMP , HEATER_2_RAW_HI_TEMP, HEATER_3_RAW_HI_TEMP);
-int Temperature::minttemp[EXTRUDERS] = { 0 };
-int Temperature::maxttemp[EXTRUDERS] = ARRAY_BY_EXTRUDERS1(16383);
+int Temperature::minttemp_raw[HOTENDS] = ARRAY_BY_HOTENDS(HEATER_0_RAW_LO_TEMP , HEATER_1_RAW_LO_TEMP , HEATER_2_RAW_LO_TEMP, HEATER_3_RAW_LO_TEMP);
+int Temperature::maxttemp_raw[HOTENDS] = ARRAY_BY_HOTENDS(HEATER_0_RAW_HI_TEMP , HEATER_1_RAW_HI_TEMP , HEATER_2_RAW_HI_TEMP, HEATER_3_RAW_HI_TEMP);
+int Temperature::minttemp[HOTENDS] = { 0 };
+int Temperature::maxttemp[HOTENDS] = ARRAY_BY_HOTENDS1(16383);
 
 #ifdef BED_MINTEMP
   int Temperature::bed_minttemp_raw = HEATER_BED_RAW_LO_TEMP;
@@ -177,7 +177,7 @@ int Temperature::maxttemp[EXTRUDERS] = ARRAY_BY_EXTRUDERS1(16383);
   millis_t Temperature::next_auto_fan_check_ms;
 #endif
 
-unsigned char Temperature::soft_pwm[EXTRUDERS];
+unsigned char Temperature::soft_pwm[HOTENDS];
 
 #if ENABLED(FAN_SOFT_PWM)
   unsigned char Temperature::soft_pwm_fan[FAN_COUNT];
@@ -189,7 +189,7 @@ unsigned char Temperature::soft_pwm[EXTRUDERS];
 
 #if HAS_PID_HEATING
 
-  void Temperature::PID_autotune(float temp, int extruder, int ncycles, bool set_result/*=false*/) {
+  void Temperature::PID_autotune(float temp, int hotend, int ncycles, bool set_result/*=false*/) {
     float input = 0.0;
     int cycles = 0;
     bool heating = true;
@@ -208,12 +208,12 @@ unsigned char Temperature::soft_pwm[EXTRUDERS];
 
     if (false
       #if ENABLED(PIDTEMP)
-         || extruder >= EXTRUDERS
+         || hotend >= HOTENDS
       #else
-         || extruder >= 0
+         || hotend >= 0
       #endif
       #if DISABLED(PIDTEMPBED)
-         || extruder < 0
+         || hotend < 0
       #endif
     ) {
       SERIAL_ECHOLN(MSG_PID_BAD_EXTRUDER_NUM);
@@ -225,12 +225,12 @@ unsigned char Temperature::soft_pwm[EXTRUDERS];
     disable_all_heaters(); // switch off all heaters.
 
     #if HAS_PID_FOR_BOTH
-      if (extruder < 0)
+      if (hotend < 0)
         soft_pwm_bed = bias = d = (MAX_BED_POWER) / 2;
       else
-        soft_pwm[extruder] = bias = d = (PID_MAX) / 2;
+        soft_pwm[hotend] = bias = d = (PID_MAX) / 2;
     #elif ENABLED(PIDTEMP)
-      soft_pwm[extruder] = bias = d = (PID_MAX) / 2;
+      soft_pwm[hotend] = bias = d = (PID_MAX) / 2;
     #else
       soft_pwm_bed = bias = d = (MAX_BED_POWER) / 2;
     #endif
@@ -245,9 +245,9 @@ unsigned char Temperature::soft_pwm[EXTRUDERS];
 
         input =
           #if HAS_PID_FOR_BOTH
-            extruder < 0 ? current_temperature_bed : current_temperature[extruder]
+            hotend < 0 ? current_temperature_bed : current_temperature[hotend]
           #elif ENABLED(PIDTEMP)
-            current_temperature[extruder]
+            current_temperature[hotend]
           #else
             current_temperature_bed
           #endif
@@ -267,12 +267,12 @@ unsigned char Temperature::soft_pwm[EXTRUDERS];
           if (ELAPSED(ms, t2 + 5000UL)) {
             heating = false;
             #if HAS_PID_FOR_BOTH
-              if (extruder < 0)
+              if (hotend < 0)
                 soft_pwm_bed = (bias - d) >> 1;
               else
-                soft_pwm[extruder] = (bias - d) >> 1;
+                soft_pwm[hotend] = (bias - d) >> 1;
             #elif ENABLED(PIDTEMP)
-              soft_pwm[extruder] = (bias - d) >> 1;
+              soft_pwm[hotend] = (bias - d) >> 1;
             #elif ENABLED(PIDTEMPBED)
               soft_pwm_bed = (bias - d) >> 1;
             #endif
@@ -290,7 +290,7 @@ unsigned char Temperature::soft_pwm[EXTRUDERS];
             if (cycles > 0) {
               long max_pow =
                 #if HAS_PID_FOR_BOTH
-                  extruder < 0 ? MAX_BED_POWER : PID_MAX
+                  hotend < 0 ? MAX_BED_POWER : PID_MAX
                 #elif ENABLED(PIDTEMP)
                   PID_MAX
                 #else
@@ -336,12 +336,12 @@ unsigned char Temperature::soft_pwm[EXTRUDERS];
               }
             }
             #if HAS_PID_FOR_BOTH
-              if (extruder < 0)
+              if (hotend < 0)
                 soft_pwm_bed = (bias + d) >> 1;
               else
-                soft_pwm[extruder] = (bias + d) >> 1;
+                soft_pwm[hotend] = (bias + d) >> 1;
             #elif ENABLED(PIDTEMP)
-              soft_pwm[extruder] = (bias + d) >> 1;
+              soft_pwm[hotend] = (bias + d) >> 1;
             #else
               soft_pwm_bed = (bias + d) >> 1;
             #endif
@@ -373,7 +373,7 @@ unsigned char Temperature::soft_pwm[EXTRUDERS];
         SERIAL_PROTOCOLLNPGM(MSG_PID_AUTOTUNE_FINISHED);
 
         #if HAS_PID_FOR_BOTH
-          const char* estring = extruder < 0 ? "bed" : "";
+          const char* estring = hotend < 0 ? "bed" : "";
           SERIAL_PROTOCOLPGM("#define  DEFAULT_"); SERIAL_PROTOCOL(estring); SERIAL_PROTOCOLPGM("Kp "); SERIAL_PROTOCOLLN(workKp);
           SERIAL_PROTOCOLPGM("#define  DEFAULT_"); SERIAL_PROTOCOL(estring); SERIAL_PROTOCOLPGM("Ki "); SERIAL_PROTOCOLLN(workKi);
           SERIAL_PROTOCOLPGM("#define  DEFAULT_"); SERIAL_PROTOCOL(estring); SERIAL_PROTOCOLPGM("Kd "); SERIAL_PROTOCOLLN(workKd);
@@ -394,15 +394,15 @@ unsigned char Temperature::soft_pwm[EXTRUDERS];
           updatePID()
 
         #define _SET_EXTRUDER_PID() \
-          PID_PARAM(Kp, extruder) = workKp; \
-          PID_PARAM(Ki, extruder) = scalePID_i(workKi); \
-          PID_PARAM(Kd, extruder) = scalePID_d(workKd); \
+          PID_PARAM(Kp, hotend) = workKp; \
+          PID_PARAM(Ki, hotend) = scalePID_i(workKi); \
+          PID_PARAM(Kd, hotend) = scalePID_d(workKd); \
           updatePID()
 
         // Use the result? (As with "M303 U1")
         if (set_result) {
           #if HAS_PID_FOR_BOTH
-            if (extruder < 0) {
+            if (hotend < 0) {
               _SET_BED_PID();
             }
             else {
@@ -430,7 +430,7 @@ Temperature::Temperature() { }
 
 void Temperature::updatePID() {
   #if ENABLED(PIDTEMP)
-    for (int e = 0; e < EXTRUDERS; e++) {
+    for (int e = 0; e < HOTENDS; e++) {
       temp_iState_max[e] = (PID_INTEGRAL_DRIVE_MAX) / PID_PARAM(Ki, e);
       #if ENABLED(PID_ADD_EXTRUSION_RATE)
         last_position[e] = 0;
@@ -459,7 +459,7 @@ int Temperature::getHeaterPower(int heater) {
       EXTRUDER_3_AUTO_FAN_PIN == EXTRUDER_2_AUTO_FAN_PIN ? 2 : 3
     };
     uint8_t fanState = 0;
-    for (int f = 0; f <= EXTRUDERS; f++) {
+    for (int f = 0; f <= HOTENDS; f++) {
       if (current_temperature[f] > EXTRUDER_AUTO_FAN_TEMPERATURE)
         SBI(fanState, fanBit[f]);
     }
@@ -665,8 +665,8 @@ void Temperature::manage_heater() {
     millis_t ms = millis();
   #endif
 
-  // Loop through all extruders
-  for (int e = 0; e < EXTRUDERS; e++) {
+  // Loop through all hotends
+  for (int e = 0; e < HOTENDS; e++) {
 
     #if ENABLED(THERMAL_PROTECTION_HOTENDS)
       thermal_runaway_protection(&thermal_runaway_state_machine[e], &thermal_runaway_timer[e], current_temperature[e], target_temperature[e], e, THERMAL_PROTECTION_PERIOD, THERMAL_PROTECTION_HYSTERESIS);
@@ -719,7 +719,7 @@ void Temperature::manage_heater() {
       }
     #endif
 
-  } // Extruders Loop
+  } // Hotends Loop
 
   #if HAS_AUTO_FAN
     if (ELAPSED(ms, next_auto_fan_check_ms)) { // only need to check fan state very infrequently
@@ -790,9 +790,9 @@ void Temperature::manage_heater() {
 // For hot end temperature measurement.
 float Temperature::analog2temp(int raw, uint8_t e) {
   #if ENABLED(TEMP_SENSOR_1_AS_REDUNDANT)
-    if (e > EXTRUDERS)
+    if (e > HOTENDS)
   #else
-    if (e >= EXTRUDERS)
+    if (e >= HOTENDS)
   #endif
     {
       SERIAL_ERROR_START;
@@ -873,7 +873,7 @@ void Temperature::updateTemperaturesFromRawValues() {
   #if ENABLED(HEATER_0_USES_MAX6675)
     current_temperature_raw[0] = read_max6675();
   #endif
-  for (uint8_t e = 0; e < EXTRUDERS; e++) {
+  for (uint8_t e = 0; e < HOTENDS; e++) {
     current_temperature[e] = Temperature::analog2temp(current_temperature_raw[e], e);
   }
   current_temperature_bed = Temperature::analog2tempBed(current_temperature_bed_raw);
@@ -926,8 +926,8 @@ void Temperature::init() {
     MCUCR = _BV(JTD);
   #endif
 
-  // Finish init of mult extruder arrays
-  for (int e = 0; e < EXTRUDERS; e++) {
+  // Finish init of mult hotend arrays
+  for (int e = 0; e < HOTENDS; e++) {
     // populate with the first value
     maxttemp[e] = maxttemp[0];
     #if ENABLED(PIDTEMP)
@@ -1083,30 +1083,30 @@ void Temperature::init() {
   #ifdef HEATER_0_MAXTEMP
     TEMP_MAX_ROUTINE(0);
   #endif
-  #if EXTRUDERS > 1
+  #if HOTENDS > 1
     #ifdef HEATER_1_MINTEMP
       TEMP_MIN_ROUTINE(1);
     #endif
     #ifdef HEATER_1_MAXTEMP
       TEMP_MAX_ROUTINE(1);
     #endif
-    #if EXTRUDERS > 2
+    #if HOTENDS > 2
       #ifdef HEATER_2_MINTEMP
         TEMP_MIN_ROUTINE(2);
       #endif
       #ifdef HEATER_2_MAXTEMP
         TEMP_MAX_ROUTINE(2);
       #endif
-      #if EXTRUDERS > 3
+      #if HOTENDS > 3
         #ifdef HEATER_3_MINTEMP
           TEMP_MIN_ROUTINE(3);
         #endif
         #ifdef HEATER_3_MAXTEMP
           TEMP_MAX_ROUTINE(3);
         #endif
-      #endif // EXTRUDERS > 3
-    #endif // EXTRUDERS > 2
-  #endif // EXTRUDERS > 1
+      #endif // HOTENDS > 3
+    #endif // HOTENDS > 2
+  #endif // HOTENDS > 1
 
   #ifdef BED_MINTEMP
     while(analog2tempBed(bed_minttemp_raw) < BED_MINTEMP) {
@@ -1163,8 +1163,8 @@ void Temperature::init() {
 #if ENABLED(THERMAL_PROTECTION_HOTENDS) || HAS_THERMALLY_PROTECTED_BED
 
   #if ENABLED(THERMAL_PROTECTION_HOTENDS)
-    Temperature::TRState Temperature::thermal_runaway_state_machine[EXTRUDERS] = { TRInactive };
-    millis_t Temperature::thermal_runaway_timer[EXTRUDERS] = { 0 };
+    Temperature::TRState Temperature::thermal_runaway_state_machine[HOTENDS] = { TRInactive };
+    millis_t Temperature::thermal_runaway_timer[HOTENDS] = { 0 };
   #endif
 
   #if HAS_THERMALLY_PROTECTED_BED
@@ -1174,7 +1174,7 @@ void Temperature::init() {
 
   void Temperature::thermal_runaway_protection(Temperature::TRState* state, millis_t* timer, float temperature, float target_temperature, int heater_id, int period_seconds, int hysteresis_degc) {
 
-    static float tr_target_temperature[EXTRUDERS + 1] = { 0.0 };
+    static float tr_target_temperature[HOTENDS + 1] = { 0.0 };
 
     /**
         SERIAL_ECHO_START;
@@ -1187,7 +1187,7 @@ void Temperature::init() {
         SERIAL_EOL;
     */
 
-    int heater_index = heater_id >= 0 ? heater_id : EXTRUDERS;
+    int heater_index = heater_id >= 0 ? heater_id : HOTENDS;
 
     // If the target temperature changes, restart
     if (tr_target_temperature[heater_index] != target_temperature) {
@@ -1218,7 +1218,7 @@ void Temperature::init() {
 #endif // THERMAL_PROTECTION_HOTENDS || THERMAL_PROTECTION_BED
 
 void Temperature::disable_all_heaters() {
-  for (int i = 0; i < EXTRUDERS; i++) setTargetHotend(0, i);
+  for (int i = 0; i < HOTENDS; i++) setTargetHotend(0, i);
   setTargetBed(0);
 
   // If all heaters go down then for sure our print job has stopped
@@ -1236,15 +1236,15 @@ void Temperature::disable_all_heaters() {
     WRITE_HEATER_0P(LOW); // Should HEATERS_PARALLEL apply here? Then change to DISABLE_HEATER(0)
   #endif
 
-  #if EXTRUDERS > 1 && HAS_TEMP_1
+  #if HOTENDS > 1 && HAS_TEMP_1
     DISABLE_HEATER(1);
   #endif
 
-  #if EXTRUDERS > 2 && HAS_TEMP_2
+  #if HOTENDS > 2 && HAS_TEMP_2
     DISABLE_HEATER(2);
   #endif
 
-  #if EXTRUDERS > 3 && HAS_TEMP_3
+  #if HOTENDS > 3 && HAS_TEMP_3
     DISABLE_HEATER(3);
   #endif
 
@@ -1390,11 +1390,11 @@ void Temperature::isr() {
 
   // Statics per heater
   ISR_STATICS(0);
-  #if (EXTRUDERS > 1) || ENABLED(HEATERS_PARALLEL)
+  #if (HOTENDS > 1) || ENABLED(HEATERS_PARALLEL)
     ISR_STATICS(1);
-    #if EXTRUDERS > 2
+    #if HOTENDS > 2
       ISR_STATICS(2);
-      #if EXTRUDERS > 3
+      #if HOTENDS > 3
         ISR_STATICS(3);
       #endif
     #endif
@@ -1418,13 +1418,13 @@ void Temperature::isr() {
       }
       else WRITE_HEATER_0P(0); // If HEATERS_PARALLEL should apply, change to WRITE_HEATER_0
 
-      #if EXTRUDERS > 1
+      #if HOTENDS > 1
         soft_pwm_1 = soft_pwm[1];
         WRITE_HEATER_1(soft_pwm_1 > 0 ? 1 : 0);
-        #if EXTRUDERS > 2
+        #if HOTENDS > 2
           soft_pwm_2 = soft_pwm[2];
           WRITE_HEATER_2(soft_pwm_2 > 0 ? 1 : 0);
-          #if EXTRUDERS > 3
+          #if HOTENDS > 3
             soft_pwm_3 = soft_pwm[3];
             WRITE_HEATER_3(soft_pwm_3 > 0 ? 1 : 0);
           #endif
@@ -1453,11 +1453,11 @@ void Temperature::isr() {
     }
 
     if (soft_pwm_0 < pwm_count) WRITE_HEATER_0(0);
-    #if EXTRUDERS > 1
+    #if HOTENDS > 1
       if (soft_pwm_1 < pwm_count) WRITE_HEATER_1(0);
-      #if EXTRUDERS > 2
+      #if HOTENDS > 2
         if (soft_pwm_2 < pwm_count) WRITE_HEATER_2(0);
-        #if EXTRUDERS > 3
+        #if HOTENDS > 3
           if (soft_pwm_3 < pwm_count) WRITE_HEATER_3(0);
         #endif
       #endif
@@ -1524,11 +1524,11 @@ void Temperature::isr() {
     if (slow_pwm_count == 0) {
 
       SLOW_PWM_ROUTINE(0); // EXTRUDER 0
-      #if EXTRUDERS > 1
+      #if HOTENDS > 1
         SLOW_PWM_ROUTINE(1); // EXTRUDER 1
-        #if EXTRUDERS > 2
+        #if HOTENDS > 2
           SLOW_PWM_ROUTINE(2); // EXTRUDER 2
-          #if EXTRUDERS > 3
+          #if HOTENDS > 3
             SLOW_PWM_ROUTINE(3); // EXTRUDER 3
           #endif
         #endif
@@ -1540,11 +1540,11 @@ void Temperature::isr() {
     } // slow_pwm_count == 0
 
     PWM_OFF_ROUTINE(0); // EXTRUDER 0
-    #if EXTRUDERS > 1
+    #if HOTENDS > 1
       PWM_OFF_ROUTINE(1); // EXTRUDER 1
-      #if EXTRUDERS > 2
+      #if HOTENDS > 2
         PWM_OFF_ROUTINE(2); // EXTRUDER 2
-        #if EXTRUDERS > 3
+        #if HOTENDS > 3
           PWM_OFF_ROUTINE(3); // EXTRUDER 3
         #endif
       #endif
@@ -1589,11 +1589,11 @@ void Temperature::isr() {
 
       // EXTRUDER 0
       if (state_timer_heater_0 > 0) state_timer_heater_0--;
-      #if EXTRUDERS > 1    // EXTRUDER 1
+      #if HOTENDS > 1    // EXTRUDER 1
         if (state_timer_heater_1 > 0) state_timer_heater_1--;
-        #if EXTRUDERS > 2    // EXTRUDER 2
+        #if HOTENDS > 2    // EXTRUDER 2
           if (state_timer_heater_2 > 0) state_timer_heater_2--;
-          #if EXTRUDERS > 3    // EXTRUDER 3
+          #if HOTENDS > 3    // EXTRUDER 3
             if (state_timer_heater_3 > 0) state_timer_heater_3--;
           #endif
         #endif
@@ -1736,7 +1736,7 @@ void Temperature::isr() {
       if (minttemp_raw[0] GE0 current_temperature_raw[0]) min_temp_error(0);
     #endif
 
-    #if HAS_TEMP_1 && EXTRUDERS > 1
+    #if HAS_TEMP_1 && HOTENDS > 1
       #if HEATER_1_RAW_LO_TEMP > HEATER_1_RAW_HI_TEMP
         #define GE1 <=
       #else
@@ -1746,7 +1746,7 @@ void Temperature::isr() {
       if (minttemp_raw[1] GE1 current_temperature_raw[1]) min_temp_error(1);
     #endif // TEMP_SENSOR_1
 
-    #if HAS_TEMP_2 && EXTRUDERS > 2
+    #if HAS_TEMP_2 && HOTENDS > 2
       #if HEATER_2_RAW_LO_TEMP > HEATER_2_RAW_HI_TEMP
         #define GE2 <=
       #else
@@ -1756,7 +1756,7 @@ void Temperature::isr() {
       if (minttemp_raw[2] GE2 current_temperature_raw[2]) min_temp_error(2);
     #endif // TEMP_SENSOR_2
 
-    #if HAS_TEMP_3 && EXTRUDERS > 3
+    #if HAS_TEMP_3 && HOTENDS > 3
       #if HEATER_3_RAW_LO_TEMP > HEATER_3_RAW_HI_TEMP
         #define GE3 <=
       #else

Marlin/temperature.h

@@ -42,9 +42,9 @@ class Temperature {
 
   public:
 
-    static int current_temperature_raw[EXTRUDERS];
-    static float current_temperature[EXTRUDERS];
-    static int target_temperature[EXTRUDERS];
+    static int current_temperature_raw[HOTENDS];
+    static float current_temperature[HOTENDS];
+    static int target_temperature[HOTENDS];
 
     static int current_temperature_bed_raw;
     static float current_temperature_bed;
@@ -66,11 +66,11 @@ class Temperature {
 
     #if ENABLED(PIDTEMP)
 
-      #if ENABLED(PID_PARAMS_PER_EXTRUDER)
+      #if ENABLED(PID_PARAMS_PER_HOTEND)
 
-        static float Kp[EXTRUDERS], Ki[EXTRUDERS], Kd[EXTRUDERS];
+        static float Kp[HOTENDS], Ki[HOTENDS], Kd[HOTENDS];
         #if ENABLED(PID_ADD_EXTRUSION_RATE)
-          static float Kc[EXTRUDERS];
+          static float Kc[HOTENDS];
         #endif
         #define PID_PARAM(param, e) Temperature::param[e]
 
@@ -82,7 +82,7 @@ class Temperature {
         #endif
         #define PID_PARAM(param, e) Temperature::param
 
-      #endif // PID_PARAMS_PER_EXTRUDER
+      #endif // PID_PARAMS_PER_HOTEND
 
       // Apply the scale factors to the PID values
       #define scalePID_i(i)   ( (i) * PID_dT )
@@ -101,8 +101,8 @@ class Temperature {
     #endif
 
     #if ENABLED(THERMAL_PROTECTION_HOTENDS) && WATCH_TEMP_PERIOD > 0
-      static int watch_target_temp[EXTRUDERS];
-      static millis_t watch_heater_next_ms[EXTRUDERS];
+      static int watch_target_temp[HOTENDS];
+      static millis_t watch_heater_next_ms[HOTENDS];
     #endif
 
     #if ENABLED(THERMAL_PROTECTION_HOTENDS) && WATCH_BED_TEMP_PERIOD > 0
@@ -127,23 +127,23 @@ class Temperature {
     static volatile bool temp_meas_ready;
 
     #if ENABLED(PIDTEMP)
-      static float temp_iState[EXTRUDERS];
-      static float temp_dState[EXTRUDERS];
-      static float pTerm[EXTRUDERS];
-      static float iTerm[EXTRUDERS];
-      static float dTerm[EXTRUDERS];
+      static float temp_iState[HOTENDS];
+      static float temp_dState[HOTENDS];
+      static float pTerm[HOTENDS];
+      static float iTerm[HOTENDS];
+      static float dTerm[HOTENDS];
 
       #if ENABLED(PID_ADD_EXTRUSION_RATE)
-        static float cTerm[EXTRUDERS];
-        static long last_position[EXTRUDERS];
+        static float cTerm[HOTENDS];
+        static long last_position[HOTENDS];
         static long lpq[LPQ_MAX_LEN];
         static int lpq_ptr;
       #endif
 
-      static float pid_error[EXTRUDERS];
-      static float temp_iState_min[EXTRUDERS];
-      static float temp_iState_max[EXTRUDERS];
-      static bool pid_reset[EXTRUDERS];
+      static float pid_error[HOTENDS];
+      static float temp_iState_min[HOTENDS];
+      static float temp_iState_max[HOTENDS];
+      static bool pid_reset[HOTENDS];
     #endif
 
     #if ENABLED(PIDTEMPBED)
@@ -163,10 +163,10 @@ class Temperature {
     static unsigned long raw_temp_bed_value;
 
     // Init min and max temp with extreme values to prevent false errors during startup
-    static int minttemp_raw[EXTRUDERS];
-    static int maxttemp_raw[EXTRUDERS];
-    static int minttemp[EXTRUDERS];
-    static int maxttemp[EXTRUDERS];
+    static int minttemp_raw[HOTENDS];
+    static int maxttemp_raw[HOTENDS];
+    static int minttemp[HOTENDS];
+    static int maxttemp[HOTENDS];
 
     #ifdef BED_MINTEMP
       static int bed_minttemp_raw;
@@ -184,7 +184,7 @@ class Temperature {
       static millis_t next_auto_fan_check_ms;
     #endif
 
-    static unsigned char soft_pwm[EXTRUDERS];
+    static unsigned char soft_pwm[HOTENDS];
 
     #if ENABLED(FAN_SOFT_PWM)
       static unsigned char soft_pwm_fan[FAN_COUNT];
@@ -230,15 +230,36 @@ class Temperature {
     //inline so that there is no performance decrease.
     //deg=degreeCelsius
 
-    static float degHotend(uint8_t extruder) { return current_temperature[extruder]; }
+    #if HOTENDS == 1
+      #define HOTEND_ARG 0
+    #else
+      #define HOTEND_ARG hotend
+    #endif
+
+    static float degHotend(uint8_t hotend) {
+      #if HOTENDS == 1
+        UNUSED(hotend);
+      #endif
+      return current_temperature[HOTEND_ARG];
+    }
     static float degBed() { return current_temperature_bed; }
 
     #if ENABLED(SHOW_TEMP_ADC_VALUES)
-    static float rawHotendTemp(uint8_t extruder) { return current_temperature_raw[extruder]; }
+    static float rawHotendTemp(uint8_t hotend) {
+      #if HOTENDS == 1
+        UNUSED(hotend);
+      #endif
+      return current_temperature_raw[HOTEND_ARG];
+    }
     static float rawBedTemp() { return current_temperature_bed_raw; }
     #endif
 
-    static float degTargetHotend(uint8_t extruder) { return target_temperature[extruder]; }
+    static float degTargetHotend(uint8_t hotend) {
+      #if HOTENDS == 1
+        UNUSED(hotend);
+      #endif
+      return target_temperature[HOTEND_ARG];
+    }
     static float degTargetBed() { return target_temperature_bed; }
 
     #if ENABLED(THERMAL_PROTECTION_HOTENDS) && WATCH_TEMP_PERIOD > 0
@@ -249,10 +270,13 @@ class Temperature {
       static void start_watching_bed();
     #endif
 
-    static void setTargetHotend(const float& celsius, uint8_t extruder) {
-      target_temperature[extruder] = celsius;
+    static void setTargetHotend(const float& celsius, uint8_t hotend) {
+      #if HOTENDS == 1
+        UNUSED(hotend);
+      #endif
+      target_temperature[HOTEND_ARG] = celsius;
       #if ENABLED(THERMAL_PROTECTION_HOTENDS) && WATCH_TEMP_PERIOD > 0
-        start_watching_heater(extruder);
+        start_watching_heater(HOTEND_ARG);
       #endif
     }
 
@@ -263,10 +287,20 @@ class Temperature {
       #endif
     }
 
-    static bool isHeatingHotend(uint8_t extruder) { return target_temperature[extruder] > current_temperature[extruder]; }
+    static bool isHeatingHotend(uint8_t hotend) {
+      #if HOTENDS == 1
+        UNUSED(hotend);
+      #endif
+      return target_temperature[HOTEND_ARG] > current_temperature[HOTEND_ARG];
+    }
     static bool isHeatingBed() { return target_temperature_bed > current_temperature_bed; }
 
-    static bool isCoolingHotend(uint8_t extruder) { return target_temperature[extruder] < current_temperature[extruder]; }
+    static bool isCoolingHotend(uint8_t hotend) {
+      #if HOTENDS == 1
+        UNUSED(hotend);
+      #endif
+      return target_temperature[HOTEND_ARG] < current_temperature[HOTEND_ARG];
+    }
     static bool isCoolingBed() { return target_temperature_bed < current_temperature_bed; }
 
     /**
@@ -283,7 +317,7 @@ class Temperature {
      * Perform auto-tuning for hotend or bed in response to M303
      */
     #if HAS_PID_HEATING
-      static void PID_autotune(float temp, int extruder, int ncycles, bool set_result=false);
+      static void PID_autotune(float temp, int hotend, int ncycles, bool set_result=false);
     #endif
 
     /**
@@ -362,8 +396,8 @@ class Temperature {
       static void thermal_runaway_protection(TRState* state, millis_t* timer, float temperature, float target_temperature, int heater_id, int period_seconds, int hysteresis_degc);
 
       #if ENABLED(THERMAL_PROTECTION_HOTENDS)
-        static TRState thermal_runaway_state_machine[EXTRUDERS];
-        static millis_t thermal_runaway_timer[EXTRUDERS];
+        static TRState thermal_runaway_state_machine[HOTENDS];
+        static millis_t thermal_runaway_timer[HOTENDS];
       #endif
 
       #if HAS_THERMALLY_PROTECTED_BED

Marlin/ultralcd.cpp

@@ -593,28 +593,28 @@ void lcd_set_home_offsets() {
   #if TEMP_SENSOR_0 != 0
     void watch_temp_callback_E0() { thermalManager.start_watching_heater(0); }
   #endif
-  #if EXTRUDERS > 1 && TEMP_SENSOR_1 != 0
+  #if HOTENDS > 1 && TEMP_SENSOR_1 != 0
     void watch_temp_callback_E1() { thermalManager.start_watching_heater(1); }
-  #endif // EXTRUDERS > 1
-  #if EXTRUDERS > 2 && TEMP_SENSOR_2 != 0
+  #endif // HOTENDS > 1
+  #if HOTENDS > 2 && TEMP_SENSOR_2 != 0
     void watch_temp_callback_E2() { thermalManager.start_watching_heater(2); }
-  #endif // EXTRUDERS > 2
-  #if EXTRUDERS > 3 && TEMP_SENSOR_3 != 0
+  #endif // HOTENDS > 2
+  #if HOTENDS > 3 && TEMP_SENSOR_3 != 0
     void watch_temp_callback_E3() { thermalManager.start_watching_heater(3); }
-  #endif // EXTRUDERS > 3
+  #endif // HOTENDS > 3
 #else
   #if TEMP_SENSOR_0 != 0
     void watch_temp_callback_E0() {}
   #endif
-  #if EXTRUDERS > 1 && TEMP_SENSOR_1 != 0
+  #if HOTENDS > 1 && TEMP_SENSOR_1 != 0
     void watch_temp_callback_E1() {}
-  #endif // EXTRUDERS > 1
-  #if EXTRUDERS > 2 && TEMP_SENSOR_2 != 0
+  #endif // HOTENDS > 1
+  #if HOTENDS > 2 && TEMP_SENSOR_2 != 0
     void watch_temp_callback_E2() {}
-  #endif // EXTRUDERS > 2
-  #if EXTRUDERS > 3 && TEMP_SENSOR_3 != 0
+  #endif // HOTENDS > 2
+  #if HOTENDS > 3 && TEMP_SENSOR_3 != 0
     void watch_temp_callback_E3() {}
-  #endif // EXTRUDERS > 3
+  #endif // HOTENDS > 3
 #endif
 
 #if ENABLED(THERMAL_PROTECTION_BED) && WATCH_BED_TEMP_PERIOD > 0
@@ -654,28 +654,28 @@ static void lcd_tune_menu() {
   // Nozzle:
   // Nozzle [1-4]:
   //
-  #if EXTRUDERS == 1
+  #if HOTENDS == 1
     #if TEMP_SENSOR_0 != 0
       MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE, &thermalManager.target_temperature[0], 0, HEATER_0_MAXTEMP - 15, watch_temp_callback_E0);
     #endif
-  #else //EXTRUDERS > 1
+  #else //HOTENDS > 1
     #if TEMP_SENSOR_0 != 0
       MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE MSG_N1, &thermalManager.target_temperature[0], 0, HEATER_0_MAXTEMP - 15, watch_temp_callback_E0);
     #endif
     #if TEMP_SENSOR_1 != 0
       MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE MSG_N2, &thermalManager.target_temperature[1], 0, HEATER_1_MAXTEMP - 15, watch_temp_callback_E1);
     #endif
-    #if EXTRUDERS > 2
+    #if HOTENDS > 2
       #if TEMP_SENSOR_2 != 0
         MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE MSG_N3, &thermalManager.target_temperature[2], 0, HEATER_2_MAXTEMP - 15, watch_temp_callback_E2);
       #endif
-      #if EXTRUDERS > 3
+      #if HOTENDS > 3
         #if TEMP_SENSOR_3 != 0
           MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE MSG_N4, &thermalManager.target_temperature[3], 0, HEATER_3_MAXTEMP - 15, watch_temp_callback_E3);
         #endif
-      #endif // EXTRUDERS > 3
-    #endif // EXTRUDERS > 2
-  #endif // EXTRUDERS > 1
+      #endif // HOTENDS > 3
+    #endif // HOTENDS > 2
+  #endif // HOTENDS > 1
 
   //
   // Bed:
@@ -777,24 +777,24 @@ void _lcd_preheat(int endnum, const float temph, const float tempb, const int fa
   void lcd_preheat_abs0() { _lcd_preheat(0, absPreheatHotendTemp, absPreheatHPBTemp, absPreheatFanSpeed); }
 #endif
 
-#if EXTRUDERS > 1
+#if HOTENDS > 1
   void lcd_preheat_pla1() { _lcd_preheat(1, plaPreheatHotendTemp, plaPreheatHPBTemp, plaPreheatFanSpeed); }
   void lcd_preheat_abs1() { _lcd_preheat(1, absPreheatHotendTemp, absPreheatHPBTemp, absPreheatFanSpeed); }
-  #if EXTRUDERS > 2
+  #if HOTENDS > 2
     void lcd_preheat_pla2() { _lcd_preheat(2, plaPreheatHotendTemp, plaPreheatHPBTemp, plaPreheatFanSpeed); }
     void lcd_preheat_abs2() { _lcd_preheat(2, absPreheatHotendTemp, absPreheatHPBTemp, absPreheatFanSpeed); }
-    #if EXTRUDERS > 3
+    #if HOTENDS > 3
       void lcd_preheat_pla3() { _lcd_preheat(3, plaPreheatHotendTemp, plaPreheatHPBTemp, plaPreheatFanSpeed); }
       void lcd_preheat_abs3() { _lcd_preheat(3, absPreheatHotendTemp, absPreheatHPBTemp, absPreheatFanSpeed); }
     #endif
   #endif
 
   void lcd_preheat_pla0123() {
-    #if EXTRUDERS > 1
+    #if HOTENDS > 1
       thermalManager.setTargetHotend(plaPreheatHotendTemp, 1);
-      #if EXTRUDERS > 2
+      #if HOTENDS > 2
         thermalManager.setTargetHotend(plaPreheatHotendTemp, 2);
-        #if EXTRUDERS > 3
+        #if HOTENDS > 3
           thermalManager.setTargetHotend(plaPreheatHotendTemp, 3);
         #endif
       #endif
@@ -802,11 +802,11 @@ void _lcd_preheat(int endnum, const float temph, const float tempb, const int fa
     lcd_preheat_pla0();
   }
   void lcd_preheat_abs0123() {
-    #if EXTRUDERS > 1
+    #if HOTENDS > 1
       thermalManager.setTargetHotend(absPreheatHotendTemp, 1);
-      #if EXTRUDERS > 2
+      #if HOTENDS > 2
         thermalManager.setTargetHotend(absPreheatHotendTemp, 2);
-        #if EXTRUDERS > 3
+        #if HOTENDS > 3
           thermalManager.setTargetHotend(absPreheatHotendTemp, 3);
         #endif
       #endif
@@ -814,7 +814,7 @@ void _lcd_preheat(int endnum, const float temph, const float tempb, const int fa
     lcd_preheat_abs0();
   }
 
-#endif // EXTRUDERS > 1
+#endif // HOTENDS > 1
 
 #if TEMP_SENSOR_BED != 0
   void lcd_preheat_pla_bedonly() { _lcd_preheat(0, 0, plaPreheatHPBTemp, plaPreheatFanSpeed); }
@@ -826,14 +826,14 @@ void _lcd_preheat(int endnum, const float temph, const float tempb, const int fa
   static void lcd_preheat_pla_menu() {
     START_MENU();
     MENU_ITEM(back, MSG_PREPARE);
-    #if EXTRUDERS == 1
+    #if HOTENDS == 1
       MENU_ITEM(function, MSG_PREHEAT_PLA, lcd_preheat_pla0);
     #else
       MENU_ITEM(function, MSG_PREHEAT_PLA_N MSG_H1, lcd_preheat_pla0);
       MENU_ITEM(function, MSG_PREHEAT_PLA_N MSG_H2, lcd_preheat_pla1);
-      #if EXTRUDERS > 2
+      #if HOTENDS > 2
         MENU_ITEM(function, MSG_PREHEAT_PLA_N MSG_H3, lcd_preheat_pla2);
-        #if EXTRUDERS > 3
+        #if HOTENDS > 3
           MENU_ITEM(function, MSG_PREHEAT_PLA_N MSG_H4, lcd_preheat_pla3);
         #endif
       #endif
@@ -848,14 +848,14 @@ void _lcd_preheat(int endnum, const float temph, const float tempb, const int fa
   static void lcd_preheat_abs_menu() {
     START_MENU();
     MENU_ITEM(back, MSG_PREPARE);
-    #if EXTRUDERS == 1
+    #if HOTENDS == 1
       MENU_ITEM(function, MSG_PREHEAT_ABS, lcd_preheat_abs0);
     #else
       MENU_ITEM(function, MSG_PREHEAT_ABS_N MSG_H1, lcd_preheat_abs0);
       MENU_ITEM(function, MSG_PREHEAT_ABS_N MSG_H2, lcd_preheat_abs1);
-      #if EXTRUDERS > 2
+      #if HOTENDS > 2
         MENU_ITEM(function, MSG_PREHEAT_ABS_N MSG_H3, lcd_preheat_abs2);
-        #if EXTRUDERS > 3
+        #if HOTENDS > 3
           MENU_ITEM(function, MSG_PREHEAT_ABS_N MSG_H4, lcd_preheat_abs3);
         #endif
       #endif
@@ -1380,8 +1380,8 @@ static void lcd_control_menu() {
 #if ENABLED(PID_AUTOTUNE_MENU)
 
   #if ENABLED(PIDTEMP)
-    int autotune_temp[EXTRUDERS] = ARRAY_BY_EXTRUDERS1(150);
-    const int heater_maxtemp[EXTRUDERS] = ARRAY_BY_EXTRUDERS(HEATER_0_MAXTEMP, HEATER_1_MAXTEMP, HEATER_2_MAXTEMP, HEATER_3_MAXTEMP);
+    int autotune_temp[HOTENDS] = ARRAY_BY_HOTENDS1(150);
+    const int heater_maxtemp[HOTENDS] = ARRAY_BY_HOTENDS(HEATER_0_MAXTEMP, HEATER_1_MAXTEMP, HEATER_2_MAXTEMP, HEATER_3_MAXTEMP);
   #endif
 
   #if ENABLED(PIDTEMPBED)
@@ -1409,14 +1409,14 @@ static void lcd_control_menu() {
   // Helpers for editing PID Ki & Kd values
   // grab the PID value out of the temp variable; scale it; then update the PID driver
   void copy_and_scalePID_i(int e) {
-    #if DISABLED(PID_PARAMS_PER_EXTRUDER)
+    #if DISABLED(PID_PARAMS_PER_HOTEND)
       UNUSED(e);
     #endif
     PID_PARAM(Ki, e) = scalePID_i(raw_Ki);
     thermalManager.updatePID();
   }
   void copy_and_scalePID_d(int e) {
-    #if DISABLED(PID_PARAMS_PER_EXTRUDER)
+    #if DISABLED(PID_PARAMS_PER_HOTEND)
       UNUSED(e);
     #endif
     PID_PARAM(Kd, e) = scalePID_d(raw_Kd);
@@ -1435,17 +1435,17 @@ static void lcd_control_menu() {
   #endif
 
   _PIDTEMP_FUNCTIONS(0);
-  #if ENABLED(PID_PARAMS_PER_EXTRUDER)
-    #if EXTRUDERS > 1
+  #if ENABLED(PID_PARAMS_PER_HOTEND)
+    #if HOTENDS > 1
       _PIDTEMP_FUNCTIONS(1);
-      #if EXTRUDERS > 2
+      #if HOTENDS > 2
         _PIDTEMP_FUNCTIONS(2);
-        #if EXTRUDERS > 3
+        #if HOTENDS > 3
           _PIDTEMP_FUNCTIONS(3);
-        #endif //EXTRUDERS > 3
-      #endif //EXTRUDERS > 2
-    #endif //EXTRUDERS > 1
-  #endif //PID_PARAMS_PER_EXTRUDER
+        #endif //HOTENDS > 3
+      #endif //HOTENDS > 2
+    #endif //HOTENDS > 1
+  #endif //PID_PARAMS_PER_HOTEND
 
 #endif //PIDTEMP
 
@@ -1466,28 +1466,28 @@ static void lcd_control_temperature_menu() {
   // Nozzle:
   // Nozzle [1-4]:
   //
-  #if EXTRUDERS == 1
+  #if HOTENDS == 1
     #if TEMP_SENSOR_0 != 0
       MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE, &thermalManager.target_temperature[0], 0, HEATER_0_MAXTEMP - 15, watch_temp_callback_E0);
     #endif
-  #else //EXTRUDERS > 1
+  #else //HOTENDS > 1
     #if TEMP_SENSOR_0 != 0
       MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE MSG_N1, &thermalManager.target_temperature[0], 0, HEATER_0_MAXTEMP - 15, watch_temp_callback_E0);
     #endif
     #if TEMP_SENSOR_1 != 0
       MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE MSG_N2, &thermalManager.target_temperature[1], 0, HEATER_1_MAXTEMP - 15, watch_temp_callback_E1);
     #endif
-    #if EXTRUDERS > 2
+    #if HOTENDS > 2
       #if TEMP_SENSOR_2 != 0
         MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE MSG_N3, &thermalManager.target_temperature[2], 0, HEATER_2_MAXTEMP - 15, watch_temp_callback_E2);
       #endif
-      #if EXTRUDERS > 3
+      #if HOTENDS > 3
         #if TEMP_SENSOR_3 != 0
           MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE MSG_N4, &thermalManager.target_temperature[3], 0, HEATER_3_MAXTEMP - 15, watch_temp_callback_E3);
         #endif
-      #endif // EXTRUDERS > 3
-    #endif // EXTRUDERS > 2
-  #endif // EXTRUDERS > 1
+      #endif // HOTENDS > 3
+    #endif // HOTENDS > 2
+  #endif // HOTENDS > 1
 
   //
   // Bed:
@@ -1558,18 +1558,18 @@ static void lcd_control_temperature_menu() {
       #define PID_MENU_ITEMS(ELABEL, eindex) _PID_MENU_ITEMS(ELABEL, eindex)
     #endif
 
-    #if ENABLED(PID_PARAMS_PER_EXTRUDER) && EXTRUDERS > 1
+    #if ENABLED(PID_PARAMS_PER_HOTEND) && HOTENDS > 1
       PID_MENU_ITEMS(MSG_E1, 0);
       PID_MENU_ITEMS(MSG_E2, 1);
-      #if EXTRUDERS > 2
+      #if HOTENDS > 2
         PID_MENU_ITEMS(MSG_E3, 2);
-        #if EXTRUDERS > 3
+        #if HOTENDS > 3
           PID_MENU_ITEMS(MSG_E4, 3);
-        #endif //EXTRUDERS > 3
-      #endif //EXTRUDERS > 2
-    #else //!PID_PARAMS_PER_EXTRUDER || EXTRUDERS == 1
+        #endif //HOTENDS > 3
+      #endif //HOTENDS > 2
+    #else //!PID_PARAMS_PER_HOTEND || HOTENDS == 1
       PID_MENU_ITEMS("", 0);
-    #endif //!PID_PARAMS_PER_EXTRUDER || EXTRUDERS == 1
+    #endif //!PID_PARAMS_PER_HOTEND || HOTENDS == 1
 
   #endif //PIDTEMP
 

Marlin/ultralcd_implementation_hitachi_HD44780.h

@@ -638,10 +638,10 @@ static void lcd_implementation_status_screen() {
     //
     // Hotend 1 or Bed Temperature
     //
-    #if EXTRUDERS > 1 || TEMP_SENSOR_BED != 0
+    #if HOTENDS > 1 || TEMP_SENSOR_BED != 0
 
       lcd.setCursor(8, 0);
-      #if EXTRUDERS > 1
+      #if HOTENDS > 1
         lcd.print(LCD_STR_THERMOMETER[0]);
         LCD_TEMP_ONLY(thermalManager.degHotend(1), thermalManager.degTargetHotend(1));
       #else
@@ -649,7 +649,7 @@ static void lcd_implementation_status_screen() {
         LCD_TEMP_ONLY(thermalManager.degBed(), thermalManager.degTargetBed());
       #endif
 
-    #endif // EXTRUDERS > 1 || TEMP_SENSOR_BED != 0
+    #endif // HOTENDS > 1 || TEMP_SENSOR_BED != 0
 
   #else // LCD_WIDTH >= 20
 
@@ -661,15 +661,15 @@ static void lcd_implementation_status_screen() {
     //
     // Hotend 1 or Bed Temperature
     //
-    #if EXTRUDERS > 1 || TEMP_SENSOR_BED != 0
+    #if HOTENDS > 1 || TEMP_SENSOR_BED != 0
       lcd.setCursor(10, 0);
-      #if EXTRUDERS > 1
+      #if HOTENDS > 1
         LCD_TEMP(thermalManager.degHotend(1), thermalManager.degTargetHotend(1), LCD_STR_THERMOMETER[0]);
       #else
         LCD_TEMP(thermalManager.degBed(), thermalManager.degTargetBed(), LCD_STR_BEDTEMP[0]);
       #endif
 
-    #endif  // EXTRUDERS > 1 || TEMP_SENSOR_BED != 0
+    #endif  // HOTENDS > 1 || TEMP_SENSOR_BED != 0
 
   #endif // LCD_WIDTH >= 20
 
@@ -697,7 +697,7 @@ static void lcd_implementation_status_screen() {
 
       lcd.setCursor(0, 1);
 
-      #if EXTRUDERS > 1 && TEMP_SENSOR_BED != 0
+      #if HOTENDS > 1 && TEMP_SENSOR_BED != 0
 
         // If we both have a 2nd extruder and a heated bed,
         // show the heated bed temp on the left,
@@ -717,7 +717,7 @@ static void lcd_implementation_status_screen() {
         _draw_axis_label(Y_AXIS, PSTR(MSG_Y), blink);
         lcd.print(ftostr4sign(current_position[Y_AXIS]));
 
-      #endif // EXTRUDERS > 1 || TEMP_SENSOR_BED != 0
+      #endif // HOTENDS > 1 || TEMP_SENSOR_BED != 0
 
     #endif // LCD_WIDTH >= 20
 
@@ -943,7 +943,7 @@ void lcd_implementation_drawedit(const char* pstr, const char* value=NULL) {
       ) leds |= LED_C;
     #endif // FAN_COUNT > 0
 
-    #if EXTRUDERS > 1
+    #if HOTENDS > 1
       if (thermalManager.degTargetHotend(1) > 0) leds |= LED_C;
     #endif