Move test extrusion options under G26

Marlin/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   //#define UBL_G26_MESH_VALIDATION // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/default/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   //#define UBL_G26_MESH_VALIDATION // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/AlephObjects/TAZ4/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/AliExpress/CL-260/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Anet/A6/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Anet/A8/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Azteeg/X5GT/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 2
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   //#define UBL_G26_MESH_VALIDATION // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/BQ/Hephestos/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/BQ/Hephestos_2/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         2.00 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/BQ/WITBOX/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Cartesio/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 3
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Creality/CR-10/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 1.75
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   //#define UBL_G26_MESH_VALIDATION // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define DEFAULT_STDDEV_FILAMENT_DIA 0.02  // Typical advertised for higher quality filament
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT        (DEFAULT_NOMINAL_FILAMENT_DIA+4*DEFAULT_STDDEV_FILAMENT_DIA) // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Felix/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Felix/DUAL/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 2
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/FolgerTech/i3-2020/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 1.75
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 25
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Geeetech/GT2560/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 1.75
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Geeetech/I3_Pro_X-GT2560/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Infitary/i3-M508/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Malyan/M150/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Micromake/C1/basic/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   //#define UBL_G26_MESH_VALIDATION // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Micromake/C1/enhanced/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   //#define UBL_G26_MESH_VALIDATION // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Mks/Sbase/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   //#define UBL_G26_MESH_VALIDATION // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/RepRapWorld/Megatronics/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/RigidBot/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1  // Single extruder. Set to 2 for dual extruders
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/SCARA/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/STM32F10/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 1.75
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   //#define UBL_G26_MESH_VALIDATION // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Sanguinololu/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 1.75
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   //#define UBL_G26_MESH_VALIDATION // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/TinyBoy2/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/UltiMachine/Archim2/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   //#define UBL_G26_MESH_VALIDATION // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Velleman/K8200/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Velleman/K8400/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/Velleman/K8400/Dual-head/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 2
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/adafruit/ST7565/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/delta/FLSUN/auto_calibrate/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 1.75
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y _PY(DELTA_PROBEABLE_RADIUS, 240)
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         1.95 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/delta/FLSUN/kossel_mini/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 1.75
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y _PY(DELTA_PROBEABLE_RADIUS, 240)
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/delta/generic/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y _PY(DELTA_PROBEABLE_RADIUS, 240)
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/delta/kossel_mini/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y _PY(DELTA_PROBEABLE_RADIUS, 240)
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/delta/kossel_pro/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y _PY(DELTA_PROBEABLE_RADIUS, 240)
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/delta/kossel_xl/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y _PY(DELTA_PROBEABLE_RADIUS, 240)
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/gCreate/gMax1.5+/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 1.75
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 211
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .5    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .35   // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/makibox/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/tvrrug/Round2/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/config/examples/wt150/Configuration.h

 // :[1, 2, 3, 4, 5]
 #define EXTRUDERS 1
 
+// Generally expected filament diameter (1.75, 2.85, 3.0, ...). Used for Volumetric, Filament Width Sensor, etc.
+#define DEFAULT_NOMINAL_FILAMENT_DIA 3.0
+
 // For Cyclops or any "multi-extruder" that shares a single nozzle.
 //#define SINGLENOZZLE
 
   #define UBL_PROBE_PT_3_Y 20
 
   #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
+  #if ENABLED(UBL_G26_MESH_VALIDATION)
+    #define MESH_TEST_NOZZLE_SIZE    0.4  // (mm) Diameter of primary nozzle.
+    #define MESH_TEST_LAYER_HEIGHT   0.2  // (mm) Default layer height for the G26 Mesh Validation Tool.
+    #define MESH_TEST_HOTEND_TEMP  205.0  // (c)  Default nozzle temperature for the G26 Mesh Validation Tool.
+    #define MESH_TEST_BED_TEMP      60.0  // (c)  Default bed temperature for the G26 Mesh Validation Tool.
+  #endif
+
   #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle
   #define UBL_SAVE_ACTIVE_ON_M500   // Save the currently active mesh in the current slot on M500
 
 //#define DEACTIVATE_SERVOS_AFTER_MOVE
 
 /**
- * Default extrusion settings
- *
- * These settings control basic extrusion from within the Marlin firmware.
- *
- */
-#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.
-#define DEFAULT_NOZZLE_SIZE           .4    // (mm) Diameter of primary nozzle.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_LAYER_HEIGHT          .2    // (mm) Default layer height that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_HOTEND_TEMP        205.0    // (c)  Default nozzle temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-#define DEFAULT_BED_TEMP            60.0    // (c)  Default bed temperature that will produce usable results by the printer.  Used by G26 Mesh Validation Pattern tool.
-
-/**
  * Filament Width Sensor
  *
  * Measures the filament width in real-time and adjusts
 //#define FILAMENT_WIDTH_SENSOR
 
 #if ENABLED(FILAMENT_WIDTH_SENSOR)
-  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor (0,1,2,3)
+  #define FILAMENT_SENSOR_EXTRUDER_NUM 0    // Index of the extruder that has the filament sensor. :[0,1,2,3,4]
   #define MEASUREMENT_DELAY_CM        14    // (cm) The distance from the filament sensor to the melting chamber
 
   #define MEASURED_UPPER_LIMIT         3.30 // (mm) Upper limit used to validate sensor reading

Marlin/src/feature/bedlevel/ubl/G26_Mesh_Validation_Tool.cpp

 
   g26_extrusion_multiplier  = EXTRUSION_MULTIPLIER;
   g26_retraction_multiplier = RETRACTION_MULTIPLIER;
-  g26_nozzle                = DEFAULT_NOZZLE_SIZE;
+  g26_nozzle                = MESH_TEST_NOZZLE_SIZE;
   g26_filament_diameter     = DEFAULT_NOMINAL_FILAMENT_DIA;
-  g26_layer_height          = DEFAULT_LAYER_HEIGHT;
+  g26_layer_height          = MESH_TEST_LAYER_HEIGHT;
   g26_prime_length          = PRIME_LENGTH;
-  g26_bed_temp              = DEFAULT_BED_TEMP;
-  g26_hotend_temp           = DEFAULT_HOTEND_TEMP;
+  g26_bed_temp              = MESH_TEST_BED_TEMP;
+  g26_hotend_temp           = MESH_TEST_HOTEND_TEMP;
   g26_prime_flag            = 0;
 
   g26_ooze_amount           = parser.linearval('O', OOZE_AMOUNT);