Clean up spacing and comments

Also clean up some trailing spaces in a few other sources

Marlin/Configuration.h

 // shouldn't use bed PID until someone else verifies your hardware works.
 // If this is enabled, find your own PID constants below.
 //#define PIDTEMPBED
-//
+
 //#define BED_LIMIT_SWITCHING
 
 // This sets the max power delivered to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.
   const bool FIL_RUNOUT_INVERTING = true;  // Should be uncommented and true or false should assigned
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
-#endif 
+#endif
 
 //===========================================================================
 //=========================== Manual Bed Leveling ===========================
 
 //   #define Z_PROBE_END_SCRIPT "G1 Z10 F12000\nG1 X15 Y330\nG1 Z0.5\nG1 Z10" //These commands will be executed in the end of G29 routine.
                                                                             //Useful to retract a deployable probe.
-                                                                           
+
   //#define Z_PROBE_SLED // turn on if you have a z-probe mounted on a sled like those designed by Charles Bell
   //#define SLED_DOCKING_OFFSET 5 // the extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
 
 #define DEFAULT_MAX_ACCELERATION      {3000,3000,100,10000}    // X, Y, Z, E maximum start speed for accelerated moves. E default values are good for Skeinforge 40+, for older versions raise them a lot.
 
 #define DEFAULT_ACCELERATION          3000    // X, Y, Z and E acceleration in mm/s^2 for printing moves
-#define DEFAULT_RETRACT_ACCELERATION  3000   // E acceleration in mm/s^2 for retracts
+#define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
 // The speed change that does not require acceleration (i.e. the software might assume it can be done instantaneously)

Marlin/configurator/config/Configuration.h

 // shouldn't use bed PID until someone else verifies your hardware works.
 // If this is enabled, find your own PID constants below.
 //#define PIDTEMPBED
-//
+
 //#define BED_LIMIT_SWITCHING
 
 // This sets the max power delivered to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.
   const bool FIL_RUNOUT_INVERTING = true;  // Should be uncommented and true or false should assigned
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
-#endif 
+#endif
 
 //===========================================================================
 //=========================== Manual Bed Leveling ===========================

Marlin/example_configurations/Felix/Configuration.h

 // shouldn't use bed PID until someone else verifies your hardware works.
 // If this is enabled, find your own PID constants below.
 #define PIDTEMPBED
-//
+
 //#define BED_LIMIT_SWITCHING
 
 // This sets the max power delivered to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.
   const bool FIL_RUNOUT_INVERTING = true;  // Should be uncommented and true or false should assigned
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
-#endif 
+#endif
   
 //===========================================================================
 //=========================== Manual Bed Leveling ===========================

Marlin/example_configurations/Felix/Configuration_DUAL.h

 // shouldn't use bed PID until someone else verifies your hardware works.
 // If this is enabled, find your own PID constants below.
 #define PIDTEMPBED
-//
+
 //#define BED_LIMIT_SWITCHING
 
 // This sets the max power delivered to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.
   const bool FIL_RUNOUT_INVERTING = true;  // Should be uncommented and true or false should assigned
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
-#endif 
+#endif
   
 //===========================================================================
 //=========================== Manual Bed Leveling ===========================

Marlin/example_configurations/Hephestos/Configuration.h

 // shouldn't use bed PID until someone else verifies your hardware works.
 // If this is enabled, find your own PID constants below.
 //#define PIDTEMPBED
-//
+
 //#define BED_LIMIT_SWITCHING
 
 // This sets the max power delivered to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.
   const bool FIL_RUNOUT_INVERTING = true;  // Should be uncommented and true or false should assigned
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
-#endif 
+#endif
   
 //===========================================================================
 //=========================== Manual Bed Leveling ===========================

Marlin/example_configurations/K8200/Configuration.h

 // shouldn't use bed PID until someone else verifies your hardware works.
 // If this is enabled, find your own PID constants below.
 //#define PIDTEMPBED
-//
+
 //#define BED_LIMIT_SWITCHING
 
 // This sets the max power delivered to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.
   const bool FIL_RUNOUT_INVERTING = true;  // Should be uncommented and true or false should assigned
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
-#endif 
+#endif
 
 //===========================================================================
 //=========================== Manual Bed Leveling ===========================

Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h

 // shouldn't use bed PID until someone else verifies your hardware works.
 // If this is enabled, find your own PID constants below.
 //#define PIDTEMPBED
-//
+
 //#define BED_LIMIT_SWITCHING
 
 // This sets the max power delivered to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.
   const bool FIL_RUNOUT_INVERTING = true;  // Should be uncommented and true or false should assigned
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
-#endif 
+#endif
 
 //===========================================================================
 //=========================== Manual Bed Leveling ===========================

Marlin/example_configurations/SCARA/Configuration.h

 // shouldn't use bed PID until someone else verifies your hardware works.
 // If this is enabled, find your own PID constants below.
 #define PIDTEMPBED
-//
+
 #define BED_LIMIT_SWITCHING
 
 // This sets the max power delivered to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.
   const bool FIL_RUNOUT_INVERTING = true;  // Should be uncommented and true or false should assigned
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
-#endif 
+#endif
   
 //===========================================================================
 //=========================== Manual Bed Leveling ===========================

Marlin/example_configurations/WITBOX/Configuration.h

 // shouldn't use bed PID until someone else verifies your hardware works.
 // If this is enabled, find your own PID constants below.
 //#define PIDTEMPBED
-//
+
 //#define BED_LIMIT_SWITCHING
 
 // This sets the max power delivered to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.
   const bool FIL_RUNOUT_INVERTING = true;  // Should be uncommented and true or false should assigned
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
-#endif 
+#endif
   
 //===========================================================================
 //=========================== Manual Bed Leveling ===========================

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

 // shouldn't use bed PID until someone else verifies your hardware works.
 // If this is enabled, find your own PID constants below.
 //#define PIDTEMPBED
-//
+
 //#define BED_LIMIT_SWITCHING
 
 // This sets the max power delivered to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.
 #define INVERT_Z_DIR false
 
 // @section extruder
+
+// For direct drive extruder v9 set to true, for geared extruder set to false.
 #define INVERT_E0_DIR false
 #define INVERT_E1_DIR false
 #define INVERT_E2_DIR false
 // #define MESH_BED_LEVELING    // Enable mesh bed leveling
 
 #ifdef MANUAL_BED_LEVELING
-  #define MBL_Z_STEP 0.025
+  #define MBL_Z_STEP 0.025  // Step size while manually probing Z axis
 #endif  // MANUAL_BED_LEVELING
 
 #ifdef MESH_BED_LEVELING
 
   #ifdef AUTO_BED_LEVELING_GRID
 
+    // set the rectangle in which to probe
     #define DELTA_PROBABLE_RADIUS (DELTA_PRINTABLE_RADIUS - 10)
-
     #define LEFT_PROBE_BED_POSITION -DELTA_PROBABLE_RADIUS
     #define RIGHT_PROBE_BED_POSITION DELTA_PROBABLE_RADIUS
     #define FRONT_PROBE_BED_POSITION -DELTA_PROBABLE_RADIUS
     #define BACK_PROBE_BED_POSITION DELTA_PROBABLE_RADIUS
-    
+
     #define MIN_PROBE_EDGE 10 // The probe square sides can be no smaller than this
 
     // Non-linear bed leveling will be used.
 
 //   #define Z_PROBE_END_SCRIPT "G1 Z10 F12000\nG1 X15 Y330\nG1 Z0.5\nG1 Z10" //These commands will be executed in the end of G29 routine.
                                                                             //Useful to retract a deployable probe.
-                                                                           
+
   //#define Z_PROBE_SLED // turn on if you have a z-probe mounted on a sled like those designed by Charles Bell
   //#define SLED_DOCKING_OFFSET 5 // the extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
 
   // Allen key retractable z-probe as seen on many Kossel delta printers - http://reprap.org/wiki/Kossel#Automatic_bed_leveling_probe
   // Deploys by touching z-axis belt. Retracts by pushing the probe down. Uses Z_MIN_PIN.
   //#define Z_PROBE_ALLEN_KEY
+
   #ifdef Z_PROBE_ALLEN_KEY
     #define Z_PROBE_ALLEN_KEY_DEPLOY_X 30
     #define Z_PROBE_ALLEN_KEY_DEPLOY_Y DELTA_PRINTABLE_RADIUS
     #define Z_PROBE_ALLEN_KEY_STOW_Z     23
     #define Z_PROBE_ALLEN_KEY_STOW_DEPTH 20
   #endif
-  
+
   //If defined, the Probe servo will be turned on only during movement and then turned off to avoid jerk
   //The value is the delay to turn the servo off after powered on - depends on the servo speed; 300ms is good value, but you can try lower it.
   // You MUST HAVE the SERVO_ENDSTOPS defined to use here a value higher than zero otherwise your code will not compile.
  * MOVEMENT SETTINGS
  */
 
-
 // delta homing speeds must be the same on xyz
 #define HOMING_FEEDRATE {200*30, 200*30, 200*30, 0}  // set the homing speeds (mm/min)
 
 #define DEFAULT_MAX_ACCELERATION      {9000,9000,9000,10000}    // X, Y, Z, E maximum start speed for accelerated moves. E default values are good for skeinforge 40+, for older versions raise them a lot.
 
 #define DEFAULT_ACCELERATION          3000    // X, Y, Z and E acceleration in mm/s^2 for printing moves
-#define DEFAULT_RETRACT_ACCELERATION  3000   // E acceleration in mm/s^2 for retracts
+#define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 
 #ifdef EEPROM_SETTINGS
   // To disable EEPROM Serial responses and decrease program space by ~1700 byte: comment this out:
-  #define EEPROM_CHITCHAT // please keep turned on if you can.
+  #define EEPROM_CHITCHAT // Please keep turned on if you can.
 #endif
 
 // @section temperature
 // @section lcd
 
 // Define your display language below. Replace (en) with your language code and uncomment.
-// en, pl, fr, de, es, ru, it, pt, pt-br, fi, an, nl, ca, eu, kana, kana_utf8, cn, test
+// en, pl, fr, de, es, ru, bg, it, pt, pt-br, fi, an, nl, ca, eu, kana, kana_utf8, cn, test
 // See also language.h
 #define LANGUAGE_INCLUDE GENERATE_LANGUAGE_INCLUDE(en)
 
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>
-
 // PanelOne from T3P3 (via RAMPS 1.4 AUX2/AUX3)
 // http://reprap.org/wiki/PanelOne
 //#define PANEL_ONE
 // ---------------------
 // 2 wire Non-latching LCD SR from:
 // https://bitbucket.org/fmalpartida/new-liquidcrystal/wiki/schematics#!shiftregister-connection
-
+// LCD configuration: http://reprap.org/wiki/SAV_3D_LCD
 //#define SAV_3DLCD
 
 // @section extras
 // Data from: http://www.doc-diy.net/photo/rc-1_hacked/
 // #define PHOTOGRAPH_PIN     23
 
-// SF send wrong arc g-codes when using Arc Point as fillet procedure
+// SkeinForge sends the wrong arc g-codes when using Arc Point as fillet procedure
 //#define SF_ARC_FIX
 
 // Support for the BariCUDA Paste Extruder.

Marlin/example_configurations/delta/generic/Configuration.h

 // shouldn't use bed PID until someone else verifies your hardware works.
 // If this is enabled, find your own PID constants below.
 //#define PIDTEMPBED
-//
+
 //#define BED_LIMIT_SWITCHING
 
 // This sets the max power delivered to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.
 #define INVERT_Z_DIR false
 
 // @section extruder
+
+// For direct drive extruder v9 set to true, for geared extruder set to false.
 #define INVERT_E0_DIR false
 #define INVERT_E1_DIR false
 #define INVERT_E2_DIR false
   const bool FIL_RUNOUT_INVERTING = true;  // Should be uncommented and true or false should assigned
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
-#endif 
-  
+#endif
+
 //===========================================================================
 //=========================== Manual Bed Leveling ===========================
 //===========================================================================
 // #define MESH_BED_LEVELING    // Enable mesh bed leveling
 
 #ifdef MANUAL_BED_LEVELING
-  #define MBL_Z_STEP 0.025
+  #define MBL_Z_STEP 0.025  // Step size while manually probing Z axis
 #endif  // MANUAL_BED_LEVELING
 
 #ifdef MESH_BED_LEVELING
 
   #ifdef AUTO_BED_LEVELING_GRID
 
+    // set the rectangle in which to probe
     #define DELTA_PROBABLE_RADIUS (DELTA_PRINTABLE_RADIUS - 10)
-
     #define LEFT_PROBE_BED_POSITION -DELTA_PROBABLE_RADIUS
     #define RIGHT_PROBE_BED_POSITION DELTA_PROBABLE_RADIUS
     #define FRONT_PROBE_BED_POSITION -DELTA_PROBABLE_RADIUS
     #define BACK_PROBE_BED_POSITION DELTA_PROBABLE_RADIUS
-    
+
     #define MIN_PROBE_EDGE 10 // The probe square sides can be no smaller than this
 
     // Non-linear bed leveling will be used.
 
 //   #define Z_PROBE_END_SCRIPT "G1 Z10 F12000\nG1 X15 Y330\nG1 Z0.5\nG1 Z10" //These commands will be executed in the end of G29 routine.
                                                                             //Useful to retract a deployable probe.
-                                                                           
+
   //#define Z_PROBE_SLED // turn on if you have a z-probe mounted on a sled like those designed by Charles Bell
   //#define SLED_DOCKING_OFFSET 5 // the extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
 
   // Allen key retractable z-probe as seen on many Kossel delta printers - http://reprap.org/wiki/Kossel#Automatic_bed_leveling_probe
   // Deploys by touching z-axis belt. Retracts by pushing the probe down. Uses Z_MIN_PIN.
   //#define Z_PROBE_ALLEN_KEY
+
   #ifdef Z_PROBE_ALLEN_KEY
     #define Z_PROBE_ALLEN_KEY_DEPLOY_X 30
     #define Z_PROBE_ALLEN_KEY_DEPLOY_Y DELTA_PRINTABLE_RADIUS
     #define Z_PROBE_ALLEN_KEY_STOW_Z     23
     #define Z_PROBE_ALLEN_KEY_STOW_DEPTH 20
   #endif
-  
+
   //If defined, the Probe servo will be turned on only during movement and then turned off to avoid jerk
   //The value is the delay to turn the servo off after powered on - depends on the servo speed; 300ms is good value, but you can try lower it.
   // You MUST HAVE the SERVO_ENDSTOPS defined to use here a value higher than zero otherwise your code will not compile.
  * MOVEMENT SETTINGS
  */
 
-
 // delta homing speeds must be the same on xyz
 #define HOMING_FEEDRATE {200*60, 200*60, 200*60, 0}  // set the homing speeds (mm/min)
 
 #define DEFAULT_MAX_ACCELERATION      {9000,9000,9000,10000}    // X, Y, Z, E maximum start speed for accelerated moves. E default values are good for skeinforge 40+, for older versions raise them a lot.
 
 #define DEFAULT_ACCELERATION          3000    // X, Y, Z and E acceleration in mm/s^2 for printing moves
-#define DEFAULT_RETRACT_ACCELERATION  3000   // E acceleration in mm/s^2 for retracts
+#define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 // The speed change that does not require acceleration (i.e. the software might assume it can be done instantaneously)
 #define DEFAULT_XYJERK                20.0    // (mm/sec)
 #define DEFAULT_ZJERK                 20.0    // (mm/sec) Must be same as XY for delta
-#define DEFAULT_EJERK                 5.0    // (mm/sec)
+#define DEFAULT_EJERK                 5.0     // (mm/sec)
 
 
 //=============================================================================
 
 #ifdef EEPROM_SETTINGS
   // To disable EEPROM Serial responses and decrease program space by ~1700 byte: comment this out:
-  #define EEPROM_CHITCHAT // please keep turned on if you can.
+  #define EEPROM_CHITCHAT // Please keep turned on if you can.
 #endif
 
 // @section temperature
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>
-
 // PanelOne from T3P3 (via RAMPS 1.4 AUX2/AUX3)
 // http://reprap.org/wiki/PanelOne
 //#define PANEL_ONE
 // ---------------------
 // 2 wire Non-latching LCD SR from:
 // https://bitbucket.org/fmalpartida/new-liquidcrystal/wiki/schematics#!shiftregister-connection
-
+// LCD configuration: http://reprap.org/wiki/SAV_3D_LCD
 //#define SAV_3DLCD
 
 // @section extras
 // Data from: http://www.doc-diy.net/photo/rc-1_hacked/
 // #define PHOTOGRAPH_PIN     23
 
-// SF send wrong arc g-codes when using Arc Point as fillet procedure
+// SkeinForge sends the wrong arc g-codes when using Arc Point as fillet procedure
 //#define SF_ARC_FIX
 
 // Support for the BariCUDA Paste Extruder.

Marlin/example_configurations/delta/kossel_mini/Configuration.h

 // shouldn't use bed PID until someone else verifies your hardware works.
 // If this is enabled, find your own PID constants below.
 //#define PIDTEMPBED
-//
+
 //#define BED_LIMIT_SWITCHING
 
 // This sets the max power delivered to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.
 // #define MESH_BED_LEVELING    // Enable mesh bed leveling
 
 #ifdef MANUAL_BED_LEVELING
-  #define MBL_Z_STEP 0.025
+  #define MBL_Z_STEP 0.025  // Step size while manually probing Z axis
 #endif  // MANUAL_BED_LEVELING
 
 #ifdef MESH_BED_LEVELING
 
   #ifdef AUTO_BED_LEVELING_GRID
 
+    // set the rectangle in which to probe
     #define DELTA_PROBABLE_RADIUS (DELTA_PRINTABLE_RADIUS - 10)
-
     #define LEFT_PROBE_BED_POSITION -DELTA_PROBABLE_RADIUS
     #define RIGHT_PROBE_BED_POSITION DELTA_PROBABLE_RADIUS
     #define FRONT_PROBE_BED_POSITION -DELTA_PROBABLE_RADIUS
   //#define Z_PROBE_SLED // turn on if you have a z-probe mounted on a sled like those designed by Charles Bell
   //#define SLED_DOCKING_OFFSET 5 // the extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
 
-  //If defined, the Probe servo will be turned on only during movement and then turned off to avoid jerk
-  //The value is the delay to turn the servo off after powered on - depends on the servo speed; 300ms is good value, but you can try lower it.
-  // You MUST HAVE the SERVO_ENDSTOPS defined to use here a value higher than zero otherwise your code will not compile.
-
   // Allen key retractable z-probe as seen on many Kossel delta printers - http://reprap.org/wiki/Kossel#Automatic_bed_leveling_probe
   // Deploys by touching z-axis belt. Retracts by pushing the probe down. Uses Z_MIN_PIN.
   #define Z_PROBE_ALLEN_KEY
   #ifdef Z_PROBE_ALLEN_KEY
+    // 2 or 3 sets of coordinates for deploying and retracting the spring loaded touch probe on G29,
+    // if servo actuated touch probe is not defined. Uncomment as appropriate for your printer/probe.
 
     // Kossel Mini
     #define Z_PROBE_ALLEN_KEY_DEPLOY_1_X 30.0
  * MOVEMENT SETTINGS
  */
 
-
 // delta homing speeds must be the same on xyz
 #define HOMING_FEEDRATE {200*60, 200*60, 200*60, 0}  // set the homing speeds (mm/min)
 
 #define DEFAULT_MAX_ACCELERATION      {9000,9000,9000,10000}    // X, Y, Z, E maximum start speed for accelerated moves. E default values are good for skeinforge 40+, for older versions raise them a lot.
 
 #define DEFAULT_ACCELERATION          3000    // X, Y, Z and E acceleration in mm/s^2 for printing moves
-#define DEFAULT_RETRACT_ACCELERATION  3000   // E acceleration in mm/s^2 for retracts
+#define DEFAULT_RETRACT_ACCELERATION  3000    // E acceleration in mm/s^2 for retracts
 #define DEFAULT_TRAVEL_ACCELERATION   3000    // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves
 
 // Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
 
 #ifdef EEPROM_SETTINGS
   // To disable EEPROM Serial responses and decrease program space by ~1700 byte: comment this out:
-  #define EEPROM_CHITCHAT // please keep turned on if you can.
+  #define EEPROM_CHITCHAT // Please keep turned on if you can.
 #endif
 
 // @section temperature
 //#define LCD_FEEDBACK_FREQUENCY_DURATION_MS 100 // the duration the buzzer plays the UI feedback sound. ie Screen Click
 //#define LCD_FEEDBACK_FREQUENCY_HZ 1000         // this is the tone frequency the buzzer plays when on UI feedback. ie Screen Click
                                                  // 0 to disable buzzer feedback. Test with M300 S<frequency Hz> P<duration ms>
-
 // PanelOne from T3P3 (via RAMPS 1.4 AUX2/AUX3)
 // http://reprap.org/wiki/PanelOne
 #define PANEL_ONE
 // ---------------------
 // 2 wire Non-latching LCD SR from:
 // https://bitbucket.org/fmalpartida/new-liquidcrystal/wiki/schematics#!shiftregister-connection
-
+// LCD configuration: http://reprap.org/wiki/SAV_3D_LCD
 //#define SAV_3DLCD
 
 // @section extras
 // Data from: http://www.doc-diy.net/photo/rc-1_hacked/
 // #define PHOTOGRAPH_PIN     23
 
-// SF send wrong arc g-codes when using Arc Point as fillet procedure
+// SkeinForge sends the wrong arc g-codes when using Arc Point as fillet procedure
 //#define SF_ARC_FIX
 
 // Support for the BariCUDA Paste Extruder.

Marlin/example_configurations/delta/kossel_pro/Configuration.h

   //#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_FUNCTIONAL_RANGE 50   // If the temperature difference between the target temperature and the actual temperature
-                                    // is more then PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
+  #define PID_FUNCTIONAL_RANGE 50 // If the temperature difference between the target temperature and the actual temperature
+                                  // is more then 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
   #define K1 0.95 //smoothing factor within the PID
 
 // If you are using a pre-configured hotend then you can use one of the value sets by uncommenting it
-
 // Ultimaker
 //    #define  DEFAULT_Kp 22.2
 //    #define  DEFAULT_Ki 1.08
 // shouldn't use bed PID until someone else verifies your hardware works.
 // If this is enabled, find your own PID constants below.
 #define PIDTEMPBED
-//
+
 //#define BED_LIMIT_SWITCHING
 
 // This sets the max power delivered to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.
  * The solution: Once the temperature reaches the target, start observing.
  * If the temperature stays too far below the target (hysteresis) for too long,
  * the firmware will halt as a safety precaution.
- *
- * Note that because the countdown starts only AFTER the temperature reaches
- * the target, this will not catch a thermistor that is already disconnected
- * when the print starts!
- *
- * To enable for all extruder heaters, uncomment the two defines below:
  */
 
 #define THERMAL_RUNAWAY_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define DELTA
 
 #ifdef DELTA
+
 // Make delta curves from many straight lines (linear interpolation).
 // This is a trade-off between visible corners (not enough segments)
 // and processor overload (too many expensive sqrt calls).
 // @section bedlevel
 
 #define ENABLE_AUTO_BED_LEVELING // Delete the comment to enable (remove // at the start of the line)
-// /// #define Z_PROBE_REPEATABILITY_TEST  // If not commented out, Z-Probe Repeatability test will be included if Auto Bed Leveling is Enabled.
+// #define Z_PROBE_REPEATABILITY_TEST  // If not commented out, Z-Probe Repeatability test will be included if Auto Bed Leveling is Enabled.
 
 #ifdef ENABLE_AUTO_BED_LEVELING
 
     // Works best with ACCURATE_BED_LEVELING_POINTS 5 or higher.
     #define NONLINEAR_BED_LEVELING
 
-  #else  // not AUTO_BED_LEVELING_GRID
+  #else  // !AUTO_BED_LEVELING_GRID
 
       // Arbitrary points to probe. A simple cross-product
       // is used to estimate the plane of the bed.
   //#define Z_PROBE_SLED // turn on if you have a z-probe mounted on a sled like those designed by Charles Bell
   //#define SLED_DOCKING_OFFSET 5 // the extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
 
-  //If defined, the Probe servo will be turned on only during movement and then turned off to avoid jerk
-  //The value is the delay to turn the servo off after powered on - depends on the servo speed; 300ms is good value, but you can try lower it.
-  // You MUST HAVE the SERVO_ENDSTOPS defined to use here a value higher than zero otherwise your code will not compile.
-
   // Allen key retractable z-probe as seen on many Kossel delta printers - http://reprap.org/wiki/Kossel#Automatic_bed_leveling_probe
   // Deploys by touching z-axis belt. Retracts by pushing the probe down. Uses Z_MIN_PIN.
   #define Z_PROBE_ALLEN_KEY
     // 2 or 3 sets of coordinates for deploying and retracting the spring loaded touch probe on G29,
     // if servo actuated touch probe is not defined. Uncomment as appropriate for your printer/probe.
 
-    // Allen key retractable z-probe as seen on many Kossel delta printers - http://reprap.org/wiki/Kossel#Automatic_bed_leveling_probe
-    // Deploys by touching z-axis belt. Retracts by pushing the probe down. Uses Z_MIN_PIN.
     //#define Z_PROBE_ALLEN_KEY_DEPLOY_1_X 30
     //#define Z_PROBE_ALLEN_KEY_DEPLOY_1_Y DELTA_PRINTABLE_RADIUS
     //#define Z_PROBE_ALLEN_KEY_DEPLOY_1_Z 100
     #define Z_PROBE_ALLEN_KEY_STOW_3_FEEDRATE HOMING_FEEDRATE_Z
   #endif
 
+  //If defined, the Probe servo will be turned on only during movement and then turned off to avoid jerk
+  //The value is the delay to turn the servo off after powered on - depends on the servo speed; 300ms is good value, but you can try lower it.
+  // You MUST HAVE the SERVO_ENDSTOPS defined to use here a value higher than zero otherwise your code will not compile.
+
 //  #define PROBE_SERVO_DEACTIVATION_DELAY 300
 
 
     #define Z_SAFE_HOMING_X_POINT ((X_MIN_POS + X_MAX_POS) / 2)    // X point for Z homing when homing all axis (G28)
     #define Z_SAFE_HOMING_Y_POINT ((Y_MIN_POS + Y_MAX_POS) / 2)    // Y point for Z homing when homing all axis (G28)
 
+  #endif
 
   // Support for a dedicated Z PROBE endstop separate from the Z MIN endstop.
   // If you would like to use both a Z PROBE and a Z MIN endstop together or just a Z PROBE with a custom pin, uncomment #define Z_PROBE_ENDSTOP and read the instructions below.
   // WARNING: Setting the wrong pin may have unexpected and potentially disastrous outcomes. Use with caution and do your homework.
 
   //#define Z_PROBE_ENDSTOP
-  #endif // Z_SAFE_HOMING
 
 #endif // ENABLE_AUTO_BED_LEVELING
 
 
   ////// #define NUM_AXIS 4 // The axis order in all axis related arrays is X, Y, Z, E
 // set the homing speeds (mm/min)
-// delta homing speeds must be the same on xyz
+/// delta homing speeds must be the same on xyz
 #define HOMING_FEEDRATE_X (200*60)
 #define HOMING_FEEDRATE_Y (200*60)
 #define HOMING_FEEDRATE_Z (200*60)
 // @section lcd
 
 // Define your display language below. Replace (en) with your language code and uncomment.
-// en, pl, fr, de, es, ru, it, pt, pt-br, fi, an, nl, ca, eu, kana, kana_utf8, cn, test
+// en, pl, fr, de, es, ru, bg, it, pt, pt-br, fi, an, nl, ca, eu, kana, kana_utf8, cn, test
 // See also language.h
 #define LANGUAGE_INCLUDE GENERATE_LANGUAGE_INCLUDE(en)
 
 // Servo Endstops
 //
 // This allows for servo actuated endstops, primary usage is for the Z Axis to eliminate calibration or bed height changes.
-// Use M206 command to correct for switch height offset to actual nozzle height. Store that setting with M500.
+// Use M851 to set the z-probe vertical offset from the nozzle. Store that setting with M500.
 //
 //#define SERVO_ENDSTOPS {-1, -1, 0} // Servo index for X, Y, Z. Disable with -1
 //#define SERVO_ENDSTOP_ANGLES {0,0, 0,0, 70,0} // X,Y,Z Axis Extend and Retract angles

Marlin/example_configurations/makibox/Configuration.h

 // shouldn't use bed PID until someone else verifies your hardware works.
 // If this is enabled, find your own PID constants below.
 //#define PIDTEMPBED
-//
+
 //#define BED_LIMIT_SWITCHING
 
 // This sets the max power delivered to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.
   const bool FIL_RUNOUT_INVERTING = true;  // Should be uncommented and true or false should assigned
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
-#endif 
+#endif
 //===========================================================================
 //=========================== Manual Bed Leveling ===========================
 //===========================================================================

Marlin/example_configurations/tvrrug/Round2/Configuration.h

 // shouldn't use bed PID until someone else verifies your hardware works.
 // If this is enabled, find your own PID constants below.
 //#define PIDTEMPBED
-//
+
 //#define BED_LIMIT_SWITCHING
 
 // This sets the max power delivered to the bed, and replaces the HEATER_BED_DUTY_CYCLE_DIVIDER option.
   const bool FIL_RUNOUT_INVERTING = true;  // Should be uncommented and true or false should assigned
   #define ENDSTOPPULLUP_FIL_RUNOUT // Uncomment to use internal pullup for filament runout pins if the sensor is defined.
   #define FILAMENT_RUNOUT_SCRIPT "M600"
-#endif 
+#endif
 
 //===========================================================================
 //=========================== Manual Bed Leveling ===========================

Marlin/temperature.cpp

   // update extruder auto fan states
   #if HAS_AUTO_FAN_0
     setExtruderAutoFanState(EXTRUDER_0_AUTO_FAN_PIN, (fanState & 1) != 0);
-  #endif 
+  #endif
   #if HAS_AUTO_FAN_1
     if (EXTRUDER_1_AUTO_FAN_PIN != EXTRUDER_0_AUTO_FAN_PIN)
       setExtruderAutoFanState(EXTRUDER_1_AUTO_FAN_PIN, (fanState & 2) != 0);
-  #endif 
+  #endif
   #if HAS_AUTO_FAN_2
     if (EXTRUDER_2_AUTO_FAN_PIN != EXTRUDER_0_AUTO_FAN_PIN
         && EXTRUDER_2_AUTO_FAN_PIN != EXTRUDER_1_AUTO_FAN_PIN)
       static unsigned char state_timer_heater_ ## n = 0
   #else
     #define ISR_STATICS(n) static unsigned char soft_pwm_ ## n
-  #endif 
+  #endif
 
   // Statics per heater
   ISR_STATICS(0);

Marlin/ultralcd.cpp

     #define encrot1 2
     #define encrot2 3
     #define encrot3 1
-  #endif 
+  #endif
 
   /**
    * Read encoder buttons from the hardware registers

Marlin/ultralcd_implementation_hitachi_HD44780.h

   // encoder click is directly connected
   #define BLEN_C 2 
   #define EN_C BIT(BLEN_C) 
-#endif 
+#endif
   
 //
 // Setup other button mappings of each panel