Merge pull request #6266 from thinkyhead/rc_cleanup_after

Cleanup after recent merges

Marlin/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER 10  // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER 0   // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/Marlin_main.cpp

         lcd_status_printf_P(0, PSTR(MSG_HOME " %s%s%s " MSG_FIRST), xx ? MSG_X : "", yy ? MSG_Y : "", zz ? MSG_Z : "");
       #endif
       return true;
-
     }
     return false;
   }
 
 #if HAS_BED_PROBE
 
- // TRIGGERED_WHEN_STOWED_TEST can easily be extended to servo probes, ... if needed.
+  // TRIGGERED_WHEN_STOWED_TEST can easily be extended to servo probes, ... if needed.
   #if ENABLED(PROBE_IS_TRIGGERED_WHEN_STOWED_TEST)
     #if ENABLED(Z_MIN_PROBE_ENDSTOP)
       #define _TRIGGERED_WHEN_STOWED_TEST (READ(Z_MIN_PROBE_PIN) != Z_MIN_PROBE_ENDSTOP_INVERTING)
     #endif
   #endif
 
-
   #if ENABLED(BLTOUCH)
     void bltouch_command(int angle) {
       servo[Z_ENDSTOP_SERVO_NR].move(angle);  // Give the BL-Touch the command and wait
         bltouch_command(BLTOUCH_RESET);    // try to reset it.
         bltouch_command(BLTOUCH_DEPLOY);   // Also needs to deploy and stow to
         bltouch_command(BLTOUCH_STOW);     // clear the triggered condition.
-        safe_delay(1500);             // wait for internal self test to complete
+        safe_delay(1500);                  // wait for internal self test to complete
                                            //   measured completion time was 0.65 seconds
                                            //   after reset, deploy & stow sequence
         if (TEST_BLTOUCH()) {              // If it still claims to be triggered...
   //   - Raise to the BETWEEN height
   // - Return the probed Z position
   //
-//float probe_pt(const float &x, const float &y, const bool stow = true, const int verbose_level = 1) {
-  float probe_pt(const float x, const float y, const bool stow, const int verbose_level) {
+  float probe_pt(const float x, const float y, const bool stow/*=true*/, const int verbose_level/*=1*/) {
     #if ENABLED(DEBUG_LEVELING_FEATURE)
       if (DEBUGGING(LEVELING)) {
         SERIAL_ECHOPAIR(">>> probe_pt(", x);
   //
   // Enable if you prefer your output in JSON format
   // suitable for SCAD or JavaScript mesh visualizers.
-  // 
+  //
   // Visualize meshes in OpenSCAD using the included script.
-  // 
+  //
   //   buildroot/shared/scripts/MarlinMesh.scad
   //
   //#define SCAD_MESH_OUTPUT
 
   #include "pinsDebug.h"
 
-
   inline void toggle_pins() {
-    int pin, j, start = 0, I_flag = 0, end = NUM_DIGITAL_PINS - 1, wait = 500, repeat = 1;
-
-    if (code_seen('R'))
-      repeat = code_value_int();
+    int pin, j;
 
-    if (code_seen('S'))
-      start = code_value_int();
+    bool I_flag = code_seen('I') ? code_value_bool() : false;
 
-    if (code_seen('E'))
-      end = code_value_int();
+    int repeat = code_seen('R') ? code_value_int() : 1,
+        start = code_seen('S') ? code_value_int() : 0,
+        end = code_seen('E') ? code_value_int() : NUM_DIGITAL_PINS - 1,
+        wait = code_seen('W') ? code_value_int() : 500;
 
-    if (code_seen('I') )
-      I_flag++;
-
-    if (code_seen('W'))
-      wait = code_value_int();
-
-    for(pin = start; pin <= end; pin++) {
-        if ( I_flag == 0 && pin_is_protected(pin)) {
+    for (pin = start; pin <= end; pin++) {
+        if (!I_flag && pin_is_protected(pin)) {
           SERIAL_ECHOPAIR("Sensitive Pin: ", pin);
           SERIAL_ECHOPGM(" untouched.\n");
         }
           pinMode(pin, OUTPUT);
           for(j = 0; j < repeat; j++) {
             digitalWrite(pin, 0);
-            idle();
-            delay(wait);
+            safe_delay(wait);
             digitalWrite(pin, 1);
-            idle();
-            delay(wait);
+            safe_delay(wait);
             digitalWrite(pin, 0);
-            idle();
-            delay(wait);
+            safe_delay(wait);
           }
         }
       SERIAL_ECHOPGM("\n");
     }
     SERIAL_ECHOPGM("Done\n");
-    return;
-  }  // toggle pin(s)
-
+  } // toggle_pins
 
   inline void servo_probe_test(){
     #if !(NUM_SERVOS >= 1 && HAS_SERVO_0)
         if (probe_counter == 0) SERIAL_PROTOCOLLNPGM("trigger not detected");
       }      // measure active signal length
     #endif
-  }        // servo_probe_test
+  } // servo_probe_test
 
   /**
    * M43: Pin debug - report pin state, watch pins, toggle pins and servo probe test/report
    *  M43 S       - Servo probe test
    *                  P<index> - Probe index (optional - defaults to 0
    */
-
   inline void gcode_M43() {
 
     if (code_seen('T')) {   // must be first ot else it's "S" and "E" parameters will execute endstop or servo test
       return;
     }
 
-
     // Get the range of pins to test or watch
     int first_pin = 0, last_pin = NUM_DIGITAL_PINS - 1;
     if (code_seen('P')) {
       if (first_pin > NUM_DIGITAL_PINS - 1) return;
     }
 
-    bool ignore_protection = code_seen('I');
+    bool ignore_protection = code_seen('I') ? code_value_bool() : false;
 
     // Watch until click, M108, or reset
-    if (code_seen('W')) { // watch digital pins
+    if (code_seen('W') && code_value_bool()) { // watch digital pins
       SERIAL_PROTOCOLLNPGM("Watching pins");
       byte pin_state[last_pin - first_pin + 1];
       for (int8_t pin = first_pin; pin <= last_pin; pin++) {
       report_pin_state_extended(pin, ignore_protection);
   }
 
-
 #endif // PINS_DEBUGGING
 
 #if ENABLED(Z_MIN_PROBE_REPEATABILITY_TEST)
 
 #endif
 
-  #ifndef MIN_COOLING_SLOPE_DEG
-    #define MIN_COOLING_SLOPE_DEG 1.50
-  #endif
-  #ifndef MIN_COOLING_SLOPE_TIME
-    #define MIN_COOLING_SLOPE_TIME 60
-  #endif
-
 /**
  * M109: Sxxx Wait for extruder(s) to reach temperature. Waits only when heating.
  *       Rxxx Wait for extruder(s) to reach temperature. Waits when heating and cooling.
  */
+
+#ifndef MIN_COOLING_SLOPE_DEG
+  #define MIN_COOLING_SLOPE_DEG 1.50
+#endif
+#ifndef MIN_COOLING_SLOPE_TIME
+  #define MIN_COOLING_SLOPE_TIME 60
+#endif
+
 inline void gcode_M109() {
 
   if (get_target_extruder_from_command(109)) return;
           residency_start_ms = now;
         }
 
-      #endif //TEMP_BED_RESIDENCY_TIME > 0
+      #endif // TEMP_BED_RESIDENCY_TIME > 0
 
       // Prevent a wait-forever situation if R is misused i.e. M190 R0
       if (wants_to_cool) {
-        // break after MIN_COOLING_SLOPE_TIME_BED seconds
+        // Break after MIN_COOLING_SLOPE_TIME_BED seconds
         // if the temperature did not drop at least MIN_COOLING_SLOPE_DEG_BED
         if (!next_cool_check_ms || ELAPSED(now, next_cool_check_ms)) {
           if (old_temp - temp < MIN_COOLING_SLOPE_DEG_BED) break;
  * M111: Set the debug level
  */
 inline void gcode_M111() {
-  marlin_debug_flags = code_seen('S') ? code_value_byte() : (uint8_t) DEBUG_NONE;
+  marlin_debug_flags = code_seen('S') ? code_value_byte() : (uint8_t)DEBUG_NONE;
 
   const static char str_debug_1[] PROGMEM = MSG_DEBUG_ECHO;
   const static char str_debug_2[] PROGMEM = MSG_DEBUG_INFO;
     #if ENABLED(ULTIPANEL)
       powersupply = true;
       LCD_MESSAGEPGM(WELCOME_MSG);
-      lcd_update();
     #endif
   }
 
       powersupply = false;
     #endif
     LCD_MESSAGEPGM(MACHINE_NAME " " MSG_OFF ".");
-    lcd_update();
   #endif
 }
 
   }
 #endif
 
-#if ENABLED(MESH_BED_LEVELING) 
+#if ENABLED(MESH_BED_LEVELING)
   /**
    * M421: Set a single Mesh Bed Leveling Z coordinate
    * Use either 'M421 X<linear> Y<linear> Z<linear>' or 'M421 I<xindex> J<yindex> Z<linear>'

Marlin/example_configurations/Cartesio/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER 10  // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER 0   // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/Felix/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER -29     // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER -12.35  // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/Felix/DUAL/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER -29     // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER -12.35  // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/Hephestos/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER -29     // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER -12.35  // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/Hephestos_2/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER 15  // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER 0   // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         2.00  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.60  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         2.00 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.60 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/K8200/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER 10  // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER 0   // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/K8400/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER 10  // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER 0   // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

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

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER 10  // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER 0   // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER -29     // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER -12.35  // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/RigidBot/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER -29     // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER -12.35  // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/SCARA/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER -29     // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER -12.35  // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/TAZ4/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER -29     // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER -12.35  // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/TinyBoy2/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER 15  // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER 0   // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 1.75  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 1.75   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/WITBOX/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER -29     // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER -12.35  // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/adafruit/ST7565/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER -29     // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER -12.35  // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/delta/flsun_kossel_mini/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER 0   // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER 0.25  // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 2000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 #define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 1.75  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 1.75   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/delta/generic/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER -10   // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER -3.5  // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 4000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/delta/kossel_mini/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER -10   // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER -3.5  // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 4000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/delta/kossel_pro/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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.
 
  * not giving someone a head crash. Use something like G29 Z-0.2 to adjust as needed.
  */
 #define Z_PROBE_OFFSET_FROM_EXTRUDER -17.25  // Increase this if the first layer is too thin (remember: it's a negative number so increase means closer to zero).
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/delta/kossel_xl/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER 0.0     // Z probe to nozzle Y offset: -front +behind
 #define Z_PROBE_OFFSET_FROM_EXTRUDER 0.3     // Z probe to nozzle Z offset: -below (always!)
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/makibox/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER -29     // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER -12.35  // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/example_configurations/tvrrug/Round2/Configuration.h

  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
-/*   Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.  */
+// Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#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 Y_PROBE_OFFSET_FROM_EXTRUDER -29     // Y offset: -front +behind [the nozzle]
 #define Z_PROBE_OFFSET_FROM_EXTRUDER -12.35  // Z offset: -below +above  [the nozzle]
 
-/*   X and Y axis travel speed (mm/m) between probes */
+// X and Y axis travel speed (mm/m) between probes
 #define XY_PROBE_SPEED 8000
 
-/*   Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH) */
+// Speed for the first approach when double-probing (with PROBE_DOUBLE_TOUCH)
 #define Z_PROBE_SPEED_FAST HOMING_FEEDRATE_Z
 
-/*   Speed for the "accurate" probe of each point  */
+// Speed for the "accurate" probe of each point
 #define Z_PROBE_SPEED_SLOW (Z_PROBE_SPEED_FAST / 2)
 
-/*   Use double touch for probing  */
+// Use double touch for probing
 //#define PROBE_DOUBLE_TOUCH
 
 /**
 // With this option servos are powered only during movement, then turned off to prevent jitter.
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
-/**********************************************************************\
- * Support for a filament diameter sensor
- * Also allows adjustment of diameter at print time (vs  at slicing)
- * Single extruder only at this point (extruder 0)
- *
- * Motherboards
- * 34 - RAMPS1.4 - uses Analog input 5 on the AUX2 connector
- * 81 - Printrboard - Uses Analog input 2 on the Exp1 connector (version B,C,D,E)
- * 301 - Rambo  - uses Analog input 3
- * Note may require analog pins to be defined for different motherboards
- **********************************************************************/
-// Uncomment below to enable
+/**
+ * Filament Width Sensor
+ *
+ * Measures the filament width in real-time and adjusts
+ * flow rate to compensate for any irregularities.
+ *
+ * Also allows the measured filament diameter to set the
+ * extrusion rate, so the slicer only has to specify the
+ * volume.
+ *
+ * Only a single extruder is supported at this time.
+ *
+ *  34 RAMPS_14    : Analog input 5 on the AUX2 connector
+ *  81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
+ * 301 RAMBO       : Analog input 3
+ *
+ * Note: May require analog pins to be defined for other boards.
+ */
 //#define FILAMENT_WIDTH_SENSOR
 
-#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00  //Enter the diameter (in mm) of the filament generally used (3.0 mm or 1.75 mm) - this is then used in the slicer software.  Used for sensor reading validation
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.00   // (mm) Diameter of the filament generally used (3.0 or 1.75mm), also used in the slicer. Used to validate sensor reading.
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0   //The number of the extruder that has the filament sensor (0,1,2)
-  #define MEASUREMENT_DELAY_CM        14   //measurement delay in cm.  This is the distance from filament sensor to middle of barrel
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
-  #define MEASURED_UPPER_LIMIT         3.30  //upper limit factor used for sensor reading validation in mm
-  #define MEASURED_LOWER_LIMIT         1.90  //lower limit factor for sensor reading validation in mm
-  #define MAX_MEASUREMENT_DELAY       20     //delay buffer size in bytes (1 byte = 1cm)- limits maximum measurement delay allowable (must be larger than MEASUREMENT_DELAY_CM  and lower number saves RAM)
+  #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading
+  #define MEASURED_LOWER_LIMIT         1.90 // (mm) Lower limit used to validate sensor reading
+  #define MAX_MEASUREMENT_DELAY       20    // (bytes) Buffer size for stored measurements (1 byte per cm). Must be larger than MEASUREMENT_DELAY_CM.
 
-  #define DEFAULT_MEASURED_FILAMENT_DIA  DEFAULT_NOMINAL_FILAMENT_DIA  //set measured to nominal initially
+  #define DEFAULT_MEASURED_FILAMENT_DIA DEFAULT_NOMINAL_FILAMENT_DIA // Set measured to nominal initially
 
-  //When using an LCD, uncomment the line below to display the Filament sensor data on the last line instead of status.  Status will appear for 5 sec.
+  // Display filament width on the LCD status line. Status messages will expire after 5 seconds.
   //#define FILAMENT_LCD_DISPLAY
 #endif
 

Marlin/nozzle.h

-/*
+/**
  * Marlin 3D Printer Firmware
  * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *

Marlin/pins.h

 #if !defined(E3_AUTO_FAN_PIN) && defined(ORIG_E3_AUTO_FAN_PIN)
   #define E3_AUTO_FAN_PIN ORIG_E3_AUTO_FAN_PIN
 #endif
+#if !defined(E4_AUTO_FAN_PIN) && defined(ORIG_E4_AUTO_FAN_PIN)
+  #define E4_AUTO_FAN_PIN ORIG_E4_AUTO_FAN_PIN
+#endif
 
 // 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,

Marlin/pinsDebug.h

 
 const char* const pin_array[][3] PROGMEM = {
 
-/**
- *  [pin name]  [pin number]  [is digital or analog]  1 = digital, 0 = analog
- *  Each entry takes up 6 bytes in FLASH:
- *     2 byte pointer to location of the name string
- *     2 bytes containing the pin number
- *         analog pin numbers were convereted to digital when the array was created
- *     2 bytes containing the digital/analog bool flag
- */
-
- // manually add pins ...
+  /**
+   *  [pin name]  [pin number]  [is digital or analog]  1 = digital, 0 = analog
+   *  Each entry takes up 6 bytes in FLASH:
+   *     2 byte pointer to location of the name string
+   *     2 bytes containing the pin number
+   *         analog pin numbers were convereted to digital when the array was created
+   *     2 bytes containing the digital/analog bool flag
+   */
+
+  // manually add pins ...
   #if SERIAL_PORT == 0
     #if AVR_ATmega2560_FAMILY
       {RXD_NAME, 0, 1},
 
 #define n_array (sizeof (pin_array) / sizeof (const char *))/3
 
-#if !defined(TIMER1B)    // working with Teensyduino extension so need to re-define some things
+#ifndef TIMER1B
+  // working with Teensyduino extension so need to re-define some things
   #include "pinsDebug_Teensyduino.h"
 #endif
 
   switch(digitalPinToTimer(pin)) {
 
     #if defined(TCCR0A) && defined(COM0A1)
-      #if defined (TIMER0A)
+      #ifdef TIMER0A
         PWM_CASE(0,A);
       #endif
       PWM_CASE(0,B);
     #if defined(TCCR1A) && defined(COM1A1)
       PWM_CASE(1,A);
       PWM_CASE(1,B);
-     #if defined(COM1C1) && defined (TIMER1C)
+     #if defined(COM1C1) && defined(TIMER1C)
       PWM_CASE(1,C);
      #endif
     #endif
 
 const uint8_t* const PWM_OCR[][3] PROGMEM = {
 
-  #if defined (TIMER0A)
+  #ifdef TIMER0A
     {&OCR0A,&OCR0B,0},
   #else
     {0,&OCR0B,0},
   #endif
 
-  #if defined(COM1C1) && defined (TIMER1C)
+  #if defined(COM1C1) && defined(TIMER1C)
    { (const uint8_t*) &OCR1A, (const uint8_t*) &OCR1B, (const uint8_t*) &OCR1C},
   #else
    { (const uint8_t*) &OCR1A, (const uint8_t*) &OCR1B,0},
   #endif
 
   #if defined(TCCR3A) && defined(COM3A1)
-    #if defined(COM3C1)
+    #ifdef COM3C1
       { (const uint8_t*) &OCR3A, (const uint8_t*) &OCR3B, (const uint8_t*) &OCR3C},
     #else
       { (const uint8_t*) &OCR3A, (const uint8_t*) &OCR3B,0},
 }
 
 
-void timer_prefix(uint8_t T, char L, uint8_t N){  // T - timer    L - pwm  n - WGM bit layout
+void timer_prefix(uint8_t T, char L, uint8_t N) {  // T - timer    L - pwm  n - WGM bit layout
   char buffer[20];   // for the sprintf statements
-  uint8_t *TCCRB = (uint8_t*) TCCR_B(T);
-  uint8_t *TCCRA = (uint8_t*) TCCR_A(T);
+  uint8_t *TCCRB = (uint8_t*)TCCR_B(T);
+  uint8_t *TCCRA = (uint8_t*)TCCR_A(T);
   uint8_t WGM = (((*TCCRB & _BV(WGM_2)) >> 1) | (*TCCRA & (_BV(WGM_0) | _BV(WGM_1))));
-  if (N == 4) WGM |=  ((*TCCRB & _BV(WGM_3)) >> 1);
+  if (N == 4) WGM |= ((*TCCRB & _BV(WGM_3)) >> 1);
 
   SERIAL_PROTOCOLPGM("    TIMER");
   SERIAL_PROTOCOLCHAR(T + '0');
   if (TEST(*TMSK, TOIE)) err_prob_interrupt();
 }
 
-
-
 static void pwm_details(uint8_t pin) {
   char buffer[20];   // for the sprintf statements
   uint8_t WGM;
 
   switch(digitalPinToTimer(pin)) {
 
-
     #if defined(TCCR0A) && defined(COM0A1)
 
-      #if defined (TIMER0A)
+      #ifdef TIMER0A
         case TIMER0A:
           timer_prefix(0,'A',3);
           break;
       case TIMER1B:
         timer_prefix(1,'B',4);
         break;
-      #if defined(COM1C1) && defined (TIMER1C)
+      #if defined(COM1C1) && defined(TIMER1C)
         case TIMER1C:
           timer_prefix(1,'C',4);
           break;
       case TIMER3B:
         timer_prefix(3,'B',4);
         break;
-      #if defined(COM3C1)
+      #ifdef COM3C1
         case TIMER3C:
           timer_prefix(3,'C',4);
           break;
   }
   SERIAL_PROTOCOLPGM("  ");
 
-// on pins that have two PWMs, print info on second PWM
+  // on pins that have two PWMs, print info on second PWM
   #if AVR_ATmega2560_FAMILY || AVR_AT90USB1286_FAMILY
-  // looking for port B7 - PWMs 0A and 1C
+    // looking for port B7 - PWMs 0A and 1C
     if ( ('B' == digitalPinToPort(pin) + 64) && (0x80 == digitalPinToBitMask(pin))) {
-      #if !defined(TEENSYDUINO_IDE)
-        SERIAL_EOL;
-        SERIAL_PROTOCOLPGM (" .                  TIMER1C is also tied to this pin             ");
+      #ifndef TEENSYDUINO_IDE
+        SERIAL_PROTOCOLPGM("\n .                  TIMER1C is also tied to this pin             ");
         timer_prefix(1,'C',4);
       #else
-        SERIAL_EOL;
-        SERIAL_PROTOCOLPGM (" .                  TIMER0A is also tied to this pin             ");
+        SERIAL_PROTOCOLPGM("\n .                  TIMER0A is also tied to this pin             ");
         timer_prefix(0,'A',3);
       #endif
     }
 
 bool get_pinMode(int8_t pin) { return *portModeRegister(digitalPinToPort(pin)) & digitalPinToBitMask(pin); }
 
-#if !defined(digitalRead_mod)    // use Teensyduino's version of digitalRead - it doesn't disable the PWMs
+#ifndef digitalRead_mod             // use Teensyduino's version of digitalRead - it doesn't disable the PWMs
   int digitalRead_mod(int8_t pin) { // same as digitalRead except the PWM stop section has been removed
     uint8_t port = digitalPinToPort(pin);
     return (port != NOT_A_PIN) && (*portInputRegister(port) & digitalPinToBitMask(pin)) ? HIGH : LOW;
 #endif
 
 void print_port(int8_t pin) {   // print port number
-  #if defined(digitalPinToPort)
+  #ifdef digitalPinToPort
     SERIAL_PROTOCOLPGM("  Port: ");
     uint8_t x = digitalPinToPort(pin) + 64;
     SERIAL_CHAR(x);
     uint8_t temp = digitalPinToBitMask(pin);
-    for (x = '0'; (x < '9' && !(temp == 1)); x++){
-      temp = temp >> 1;
-    }
+    for (x = '0'; x < '9' && temp != 1; x++) temp >>= 1;
     SERIAL_CHAR(x);
   #else
-    SERIAL_PROTOCOLPGM("          ")
+    SERIAL_PROTOCOLPGM("          ");
   #endif
 }
 
-
 // pretty report with PWM info
 inline void report_pin_state_extended(int8_t pin, bool ignore, bool extended = true) {
   uint8_t temp_char;
   char *name_mem_pointer;
   char buffer[30];   // for the sprintf statements
-  bool found = false;
-  bool multi_name_pin = false;
+  bool found = false,
+       multi_name_pin = false;
   for (uint8_t x = 0; x < n_array; x++)  {    // scan entire array and report all instances of this pin
     if (pgm_read_byte(&pin_array[x][1]) == pin) {
-      if (found == true) multi_name_pin = true;
+      if (found) multi_name_pin = true;
       found = true;
-      if (multi_name_pin == false) {    // report digitial and analog pin number only on the first time through
-        sprintf(buffer, "PIN:% 3d ", pin);     // digital pin number
+      if (!multi_name_pin) {    // report digitial and analog pin number only on the first time through
+        sprintf(buffer, "PIN: %3d ", pin);     // digital pin number
         SERIAL_ECHO(buffer);
         print_port(pin);
         if (IS_ANALOG(pin)) {
         temp_char = pgm_read_byte(name_mem_pointer + y);
         if (temp_char != 0) MYSERIAL.write(temp_char);
         else {
-          for (uint8_t i = 0; i < 28 - y; i++) MYSERIAL.write(" ");
+          for (uint8_t i = 0; i < 28 - y; i++) MYSERIAL.write(' ');
           break;
         }
       }
         SERIAL_ECHOPGM("protected ");
       else {
         if (!(pgm_read_byte(&pin_array[x][2]))) {
-          sprintf(buffer, "Analog in =% 5d", analogRead(pin - analogInputToDigitalPin(0)));
+          sprintf(buffer, "Analog in = %5d", analogRead(pin - analogInputToDigitalPin(0)));
           SERIAL_ECHO(buffer);
         }
         else {
           if (!get_pinMode(pin)) {
-//            pinMode(pin, INPUT_PULLUP);  // make sure input isn't floating - stopped doing this 
+            //pinMode(pin, INPUT_PULLUP);  // make sure input isn't floating - stopped doing this
                                            // because this could interfere with inductive/capacitive
                                            // sensors (high impedance voltage divider) and with PT100 amplifier
             SERIAL_PROTOCOLPAIR("Input  = ", digitalRead_mod(pin));
           }
           else SERIAL_PROTOCOLPAIR("Output = ", digitalRead_mod(pin));
         }
-        if (multi_name_pin == false && extended) pwm_details(pin);  // report PWM capabilities only on the first pass & only if doing an extended report
+        if (!multi_name_pin && extended) pwm_details(pin);  // report PWM capabilities only on the first pass & only if doing an extended report
       }
       SERIAL_EOL;
     }  // end of IF
   } // end of for loop
 
-  if (found == false) {
-    sprintf(buffer, "PIN:% 3d ", pin);
+  if (!found) {
+    sprintf(buffer, "PIN: %3d ", pin);
     SERIAL_ECHO(buffer);
     print_port(pin);
     if (IS_ANALOG(pin)) {
       sprintf(buffer, " (A%2d)  ", int(pin - analogInputToDigitalPin(0)));    // analog pin number
       SERIAL_ECHO(buffer);
     }
-    else SERIAL_ECHOPGM("        ");   // add padding if not an analog pin
+    else
+      SERIAL_ECHOPGM("        ");   // add padding if not an analog pin
     SERIAL_ECHOPGM("<unused/unknown>");
-    if (get_pinMode(pin)) {
+    if (get_pinMode(pin))
       SERIAL_PROTOCOLPAIR("            Output = ", digitalRead_mod(pin));
-    }
     else {
       if (IS_ANALOG(pin)) {
-        sprintf(buffer, "   Analog in =% 5d", analogRead(pin - analogInputToDigitalPin(0)));
+        sprintf(buffer, "   Analog in = %5d", analogRead(pin - analogInputToDigitalPin(0)));
         SERIAL_ECHO(buffer);
       }
-      else {
+      else
         SERIAL_ECHOPGM("         ");   // add padding if not an analog pin
-      } 
+
       SERIAL_PROTOCOLPAIR("   Input  = ", digitalRead_mod(pin));
-    }  
-//    if (!pwm_status(pin)) SERIAL_ECHOPGM(" ");    // add padding if it's not a PWM pin
+    }
+    //if (!pwm_status(pin)) SERIAL_ECHOCHAR(' ');    // add padding if it's not a PWM pin
     if (extended) pwm_details(pin);  // report PWM capabilities only if doing an extended report
     SERIAL_EOL;
   }
 }
 
 inline void report_pin_state(int8_t pin) {
-
   report_pin_state_extended(pin, false, false);
-
 }

Marlin/printcounter.cpp

-/*
+/**
  * Marlin 3D Printer Firmware
  * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *

Marlin/printcounter.h

-/*
+/**
  * Marlin 3D Printer Firmware
  * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *

Marlin/stepper.cpp

 
 void Stepper::isr() {
 
-  static uint32_t step_remaining = 0;
-
   uint16_t ocr_val;
 
   #define ENDSTOP_NOMINAL_OCR_VAL 3000    // check endstops every 1.5ms to guarantee two stepper ISRs within 5ms for BLTouch
   #if ENABLED(ENDSTOP_INTERRUPTS_FEATURE)
     #define SPLIT(L) _SPLIT(L)
   #else                 // sample endstops in between step pulses
+    static uint32_t step_remaining = 0;
     #define SPLIT(L) do { \
       _SPLIT(L); \
       if (ENDSTOPS_ENABLED && L > ENDSTOP_NOMINAL_OCR_VAL) { \
       _ENABLE_ISRs(); // re-enable ISRs
       return;
     }
-  # endif
+  #endif
 
   if (cleaning_buffer_counter) {
     --cleaning_buffer_counter;

Marlin/stopwatch.cpp

-/*
+/**
  * Marlin 3D Printer Firmware
  * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *

Marlin/stopwatch.h

-/*
+/**
  * Marlin 3D Printer Firmware
  * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *

Marlin/twibus.cpp

-/*
+/**
  * Marlin 3D Printer Firmware
  * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *

Marlin/twibus.h

-/*
+/**
  * Marlin 3D Printer Firmware
  * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
  *