updated examples

Marlin/example_configurations/SCARA/Configuration.h

 #define EXTRUDE_MINTEMP 150
 #define EXTRUDE_MAXLENGTH (X_MAX_LENGTH+Y_MAX_LENGTH) //prevent extrusion of very large distances.
 
+/*================== Thermal Runaway Protection ==============================
+This is a feature to protect your printer from burn up in flames if it has
+a thermistor coming off place (this happened to a friend of mine recently and
+motivated me writing this feature).
+
+The issue: If a thermistor come off, it will read a lower temperature than actual.
+The system will turn the heater on forever, burning up the filament and anything
+else around.
+
+After the temperature reaches the target for the first time, this feature will 
+start measuring for how long the current temperature stays below the target 
+minus _HYSTERESIS (set_temperature - THERMAL_RUNAWAY_PROTECTION_HYSTERESIS).
+
+If it stays longer than _PERIOD, it means the thermistor temperature
+cannot catch up with the target, so something *may be* wrong. Then, to be on the
+safe side, the system will he halt.
+
+Bear in mind the count down will just start AFTER the first time the 
+thermistor temperature is over the target, so you will have no problem if
+your extruder heater takes 2 minutes to hit the target on heating.
+
+*/
+// If you want to enable this feature for all your extruder heaters,
+// uncomment the 2 defines below:
+
+// Parameters for all extruder heaters
+//#define THERMAL_RUNAWAY_PROTECTION_PERIOD 40 //in seconds
+//#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius
+
+// If you want to enable this feature for your bed heater,
+// uncomment the 2 defines below:
+
+// Parameters for the bed heater
+//#define THERMAL_RUNAWAY_PROTECTION_BED_PERIOD 20 //in seconds
+//#define THERMAL_RUNAWAY_PROTECTION_BED_HYSTERESIS 2 // in degree Celsius
+//===========================================================================
+
 //===========================================================================
 //=============================Mechanical Settings===========================
 //===========================================================================

Marlin/example_configurations/SCARA/Configuration_adv.h

 #ifdef BED_LIMIT_SWITCHING
   #define BED_HYSTERESIS 2 //only disable heating if T>target+BED_HYSTERESIS and enable heating if T>target-BED_HYSTERESIS
 #endif
-#define BED_CHECK_INTERVAL 5000 //ms between checks in bang-bang control
+#define BED_CHECK_INTERVAL 3000 //ms between checks in bang-bang control
 
 //// Heating sanity check:
 // This waits for the watch period in milliseconds whenever an M104 or M109 increases the target temperature
 //  extruder run-out prevention.
 //if the machine is idle, and the temperature over MINTEMP, every couple of SECONDS some filament is extruded
 //#define EXTRUDER_RUNOUT_PREVENT
-#define EXTRUDER_RUNOUT_MINTEMP 190
+#define EXTRUDER_RUNOUT_MINTEMP 180
 #define EXTRUDER_RUNOUT_SECONDS 30.
 #define EXTRUDER_RUNOUT_ESTEPS 14. //mm filament
-#define EXTRUDER_RUNOUT_SPEED 1500.  //extrusion speed
+#define EXTRUDER_RUNOUT_SPEED 180.  //extrusion speed
 #define EXTRUDER_RUNOUT_EXTRUDE 100
 
 //These defines help to calibrate the AD595 sensor in case you get wrong temperature measurements.
 // Hooke's law says:		force = k * distance
 // Bernoulli's principle says:	v ^ 2 / 2 + g . h + pressure / density = constant
 // so: v ^ 2 is proportional to number of steps we advance the extruder
-//#define ADVANCE
+#define ADVANCE
 
 #ifdef ADVANCE
   #define EXTRUDER_ADVANCE_K .0
 
   #define D_FILAMENT 1.75
-  #define STEPS_MM_E 836
+  #define STEPS_MM_E 1000
   #define EXTRUTION_AREA (0.25 * D_FILAMENT * D_FILAMENT * 3.14159)
   #define STEPS_PER_CUBIC_MM_E (axis_steps_per_unit[E_AXIS]/ EXTRUTION_AREA)
 
 #ifdef FWRETRACT
   #define MIN_RETRACT 0.1                //minimum extruded mm to accept a automatic gcode retraction attempt
   #define RETRACT_LENGTH 3               //default retract length (positive mm)
-  #define RETRACT_FEEDRATE 30            //default feedrate for retracting (mm/s)
+  #define RETRACT_FEEDRATE 35            //default feedrate for retracting (mm/s)
   #define RETRACT_ZLIFT 0                //default retract Z-lift
   #define RETRACT_RECOVER_LENGTH 0       //default additional recover length (mm, added to retract length when recovering)
   #define RETRACT_RECOVER_FEEDRATE 8     //default feedrate for recovering from retraction (mm/s)