Comment on filament runout sensor config

Marlin/Configuration.h

@@ -725,13 +725,15 @@
 #define Y_MAX_POS 200
 #define Z_MAX_POS 200
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/Cartesio/Configuration.h

@@ -725,13 +725,15 @@
 #define Y_MAX_POS 270
 #define Z_MAX_POS 400
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/Felix/Configuration.h

@@ -708,13 +708,15 @@
 #define Y_MAX_POS 205
 #define Z_MAX_POS 235
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/Felix/DUAL/Configuration.h

@@ -708,13 +708,15 @@
 #define Y_MAX_POS 205
 #define Z_MAX_POS 235
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/Hephestos/Configuration.h

@@ -717,13 +717,15 @@
 #define Y_MAX_POS 210
 #define Z_MAX_POS 180
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/Hephestos_2/Configuration.h

@@ -719,13 +719,15 @@
 #define Y_MAX_POS 297
 #define Z_MAX_POS 210
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/K8200/Configuration.h

@@ -754,13 +754,15 @@
 #define Y_MAX_POS 200
 #define Z_MAX_POS 200
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/K8400/Configuration.h

@@ -725,13 +725,15 @@
 #define Y_MAX_POS 200
 #define Z_MAX_POS 190
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/K8400/Dual-head/Configuration.h

@@ -725,13 +725,15 @@
 #define Y_MAX_POS 200
 #define Z_MAX_POS 190
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h

@@ -725,13 +725,15 @@
 #define Y_MAX_POS 200
 #define Z_MAX_POS 200
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/RigidBot/Configuration.h

@@ -724,13 +724,15 @@
 #define Y_MAX_POS 248  // RigidBot regular is 248mm, RigitBot Big is 304mm
 #define Z_MAX_POS 254  // RigidBot regular and Big are 254mm
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/SCARA/Configuration.h

@@ -740,13 +740,15 @@
 #define Y_MAX_POS 200
 #define Z_MAX_POS 225
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/TAZ4/Configuration.h

@@ -746,13 +746,15 @@
 #define Y_MAX_POS 275
 #define Z_MAX_POS 250
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/WITBOX/Configuration.h

@@ -717,13 +717,15 @@
 #define Y_MAX_POS 210
 #define Z_MAX_POS 200
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/adafruit/ST7565/Configuration.h

@@ -725,13 +725,15 @@
 #define Y_MAX_POS 200
 #define Z_MAX_POS 200
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/delta/generic/Configuration.h

@@ -811,13 +811,15 @@
 #define Y_MAX_POS DELTA_PRINTABLE_RADIUS
 #define Z_MAX_POS MANUAL_Z_HOME_POS
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/delta/kossel_mini/Configuration.h

@@ -814,13 +814,15 @@
 #define Y_MAX_POS DELTA_PRINTABLE_RADIUS
 #define Z_MAX_POS MANUAL_Z_HOME_POS
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/delta/kossel_pro/Configuration.h

@@ -813,13 +813,15 @@
 #define Y_MAX_POS DELTA_PRINTABLE_RADIUS
 #define Z_MAX_POS MANUAL_Z_HOME_POS
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/delta/kossel_xl/Configuration.h

@@ -817,13 +817,15 @@
 #define Y_MAX_POS DELTA_PRINTABLE_RADIUS
 #define Z_MAX_POS MANUAL_Z_HOME_POS
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/makibox/Configuration.h

@@ -728,13 +728,15 @@
 #define Y_MAX_POS 150
 #define Z_MAX_POS 86
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.

Marlin/example_configurations/tvrrug/Round2/Configuration.h

@@ -721,13 +721,15 @@
 #define Y_MAX_POS 205
 #define Z_MAX_POS 120
 
-//===========================================================================
-//========================= Filament Runout Sensor ==========================
-//===========================================================================
-//#define FILAMENT_RUNOUT_SENSOR // Uncomment for defining a filament runout sensor such as a mechanical or opto endstop to check the existence of filament
-                                 // RAMPS-based boards use SERVO3_PIN. For other boards you may need to define FIL_RUNOUT_PIN.
-                                 // It is assumed that when logic high = filament available
-                                 //                    when logic  low = filament ran out
+/**
+ * Filament Runout Sensor
+ * A mechanical or opto endstop is used to check for the presence of filament.
+ *
+ * RAMPS-based boards use SERVO3_PIN.
+ * For other boards you may need to define FIL_RUNOUT_PIN.
+ * By default the firmware assumes HIGH = has filament, LOW = ran out
+ */
+//#define FILAMENT_RUNOUT_SENSOR
 #if ENABLED(FILAMENT_RUNOUT_SENSOR)
   #define FIL_RUNOUT_INVERTING false // set to true to invert the logic of the sensor.
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.