[2.0.x] LIN_ADVANCE v1.5 (#9712)

Marlin/Configuration_adv.h

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

Marlin/src/config/default/Configuration_adv.h

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -712,43 +712,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

Marlin/src/config/examples/BIBO/TouchX/Configuration_adv.h

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

Marlin/src/config/examples/Creality/CR-10S/Configuration_adv.h

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

Marlin/src/config/examples/Creality/Ender/Configuration_adv.h

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

Marlin/src/config/examples/JGAurora/A5/Configuration_adv.h

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

Marlin/src/config/examples/MakerParts/Configuration_adv.h

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

Marlin/src/config/examples/Malyan/M200/Configuration_adv.h

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -719,43 +719,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

Marlin/src/config/examples/TheBorg/Configuration_adv.h

@@ -708,43 +708,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -724,43 +724,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 140 // start value for PLA on K8200
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

Marlin/src/config/examples/Wanhao/Duplicator 6/Configuration_adv.h

@@ -713,43 +713,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 #define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 0
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0     // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -713,43 +713,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

Marlin/src/config/examples/delta/FLSUN/kossel/Configuration_adv.h

@@ -713,43 +713,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -713,43 +713,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -713,43 +713,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -713,43 +713,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -718,43 +718,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -713,43 +713,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -711,43 +711,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

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

@@ -712,43 +712,25 @@
 // @section extruder
 
 /**
- * Implementation of linear pressure control
+ * Linear Pressure Control v1.5
  *
- * Assumption: advance = k * (delta velocity)
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
  * K=0 means advance disabled.
- * See Marlin documentation for calibration instructions.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differ from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
-
 #if ENABLED(LIN_ADVANCE)
-  #define LIN_ADVANCE_K 75
-
-  /**
-   * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-   * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-   * While this is harmless for normal printing (the fluid nature of the filament will
-   * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-   *
-   * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-   * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-   * if the slicer is using variable widths or layer heights within one print!
-   *
-   * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-   *
-   * Example: `M900 W0.4 H0.2 D1.75`, where:
-   *   - W is the extrusion width in mm
-   *   - H is the layer height in mm
-   *   - D is the filament diameter in mm
-   *
-   * Example: `M900 R0.0458` to set the ratio directly.
-   *
-   * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-   *
-   * Slic3r (including Průša Control) produces Gcode compatible with the automatic mode.
-   * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-   */
-  #define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                  // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0.22  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_DEBUG          // If enabled, this will generate debug information output over USB.
 #endif
 
 // @section leveling

Marlin/src/gcode/feature/advance/M900.cpp

@@ -29,34 +29,19 @@
 #include "../../../module/stepper.h"
 
 /**
- * M900: Set and/or Get advance K factor and WH/D ratio
+ * M900: Set and/or Get advance K factor
  *
  *  K<factor>                  Set advance K factor
- *  R<ratio>                   Set ratio directly (overrides WH/D)
- *  W<width> H<height> D<diam> Set ratio from WH/D
  */
 void GcodeSuite::M900() {
-  stepper.synchronize();
+    stepper.synchronize();
 
-  const float newK = parser.floatval('K', -1);
-  if (newK >= 0) planner.extruder_advance_k = newK;
+    const float newK = parser.floatval('K', -1);
+    if (newK >= 0) planner.extruder_advance_K = newK;
 
-  float newR = parser.floatval('R', -1);
-  if (newR < 0) {
-    const float newD = parser.floatval('D', -1),
-                newW = parser.floatval('W', -1),
-                newH = parser.floatval('H', -1);
-    if (newD >= 0 && newW >= 0 && newH >= 0)
-      newR = newD ? (newW * newH) / CIRCLE_AREA(newD * 0.5) : 0;
-  }
-  if (newR >= 0) planner.advance_ed_ratio = newR;
-
-  SERIAL_ECHO_START();
-  SERIAL_ECHOPAIR("Advance K=", planner.extruder_advance_k);
-  SERIAL_ECHOPGM(" E/D=");
-  const float ratio = planner.advance_ed_ratio;
-  if (ratio) SERIAL_ECHO(ratio); else SERIAL_ECHOPGM("Auto");
-  SERIAL_EOL();
+    SERIAL_ECHO_START();
+    SERIAL_ECHOPAIR("Advance K=", planner.extruder_advance_K);
+    SERIAL_EOL();
 }
 
 #endif // LIN_ADVANCE

Marlin/src/inc/Conditionals_LCD.h

@@ -399,7 +399,6 @@
  *  HOTENDS      - Number of hotends, whether connected or separate
  *  E_STEPPERS   - Number of actual E stepper motors
  *  E_MANUAL     - Number of E steppers for LCD move options
- *  TOOL_E_INDEX - Index to use when getting/setting the tool state
  *
  */
 #if ENABLED(SINGLENOZZLE) || ENABLED(MIXING_EXTRUDER)         // One hotend, one thermistor, no XY offset
@@ -426,24 +425,19 @@
   #if EXTRUDERS > 4
     #define E_STEPPERS    3
     #define E_MANUAL      3
-    #define TOOL_E_INDEX  current_block->active_extruder
   #elif EXTRUDERS > 2
     #define E_STEPPERS    2
     #define E_MANUAL      2
-    #define TOOL_E_INDEX  current_block->active_extruder
   #else
     #define E_STEPPERS    1
-    #define TOOL_E_INDEX  0
   #endif
   #define E_MANUAL        E_STEPPERS
 #elif ENABLED(MIXING_EXTRUDER)
   #define E_STEPPERS      MIXING_STEPPERS
   #define E_MANUAL        1
-  #define TOOL_E_INDEX    0
 #else
   #define E_STEPPERS      EXTRUDERS
   #define E_MANUAL        EXTRUDERS
-  #define TOOL_E_INDEX    current_block->active_extruder
 #endif
 
 /**

Marlin/src/inc/SanityCheck.h

@@ -223,6 +223,8 @@
   #error "MIN_RETRACT is now MIN_AUTORETRACT and MAX_AUTORETRACT. Please update your Configuration_adv.h."
 #elif defined(ADVANCE)
   #error "ADVANCE was removed in Marlin 1.1.6. Please use LIN_ADVANCE."
+#elif defined(LIN_ADVANCE_E_D_RATIO)
+  #error "LIN_ADVANCE (1.5) no longer uses LIN_ADVANCE_E_D_RATIO. Check your configuration."
 #elif defined(NEOPIXEL_RGBW_LED)
   #error "NEOPIXEL_RGBW_LED is now NEOPIXEL_LED. Please update your configuration."
 #elif defined(UBL_MESH_INSET)
@@ -552,10 +554,6 @@ static_assert(X_MAX_LENGTH >= X_BED_SIZE && Y_MAX_LENGTH >= Y_BED_SIZE,
   #endif
 #endif
 
-#if ENABLED(LIN_ADVANCE) && !IS_CARTESIAN
-  #error "Sorry! LIN_ADVANCE is only compatible with Cartesian."
-#endif
-
 /**
  * Parking Extruder requirements
  */

Marlin/src/lcd/ultralcd.cpp

@@ -3228,7 +3228,7 @@ void kill_screen(const char* lcd_msg) {
     #if DISABLED(NO_VOLUMETRICS) || ENABLED(ADVANCED_PAUSE_FEATURE)
       MENU_ITEM(submenu, MSG_FILAMENT, lcd_control_filament_menu);
     #elif ENABLED(LIN_ADVANCE)
-      MENU_ITEM_EDIT(float3, MSG_ADVANCE_K, &planner.extruder_advance_k, 0, 999);
+      MENU_ITEM_EDIT(float32, MSG_ADVANCE_K, &planner.extruder_advance_K, 0, 999);
     #endif
 
     #if HAS_LCD_CONTRAST
@@ -3742,7 +3742,7 @@ void kill_screen(const char* lcd_msg) {
       MENU_BACK(MSG_CONTROL);
 
       #if ENABLED(LIN_ADVANCE)
-        MENU_ITEM_EDIT(float3, MSG_ADVANCE_K, &planner.extruder_advance_k, 0, 999);
+        MENU_ITEM_EDIT(float32, MSG_ADVANCE_K, &planner.extruder_advance_K, 0, 999);
       #endif
 
       #if DISABLED(NO_VOLUMETRICS)

Marlin/src/module/configuration_store.cpp

@@ -37,7 +37,7 @@
  */
 
 // Change EEPROM version if the structure changes
-#define EEPROM_VERSION "V51"
+#define EEPROM_VERSION "V52"
 #define EEPROM_OFFSET 100
 
 // Check the integrity of data offsets.
@@ -225,8 +225,7 @@ typedef struct SettingsDataStruct {
   //
   // LIN_ADVANCE
   //
-  float planner_extruder_advance_k,                     // M900 K    planner.extruder_advance_k
-        planner_advance_ed_ratio;                       // M900 WHD  planner.advance_ed_ratio
+  float planner_extruder_advance_K;                     // M900 K    planner.extruder_advance_K
 
   //
   // HAS_MOTOR_CURRENT_PWM
@@ -751,15 +750,13 @@ void MarlinSettings::postprocess() {
     // Linear Advance
     //
 
-    _FIELD_TEST(planner_extruder_advance_k);
+    _FIELD_TEST(planner_extruder_advance_K);
 
     #if ENABLED(LIN_ADVANCE)
-      EEPROM_WRITE(planner.extruder_advance_k);
-      EEPROM_WRITE(planner.advance_ed_ratio);
+      EEPROM_WRITE(planner.extruder_advance_K);
     #else
       dummy = 0.0f;
       EEPROM_WRITE(dummy);
-      EEPROM_WRITE(dummy);
     #endif
 
     _FIELD_TEST(motor_current_setting);
@@ -1301,14 +1298,12 @@ void MarlinSettings::postprocess() {
       // Linear Advance
       //
 
-      _FIELD_TEST(planner_extruder_advance_k);
+      _FIELD_TEST(planner_extruder_advance_K);
 
       #if ENABLED(LIN_ADVANCE)
-        EEPROM_READ(planner.extruder_advance_k);
-        EEPROM_READ(planner.advance_ed_ratio);
+        EEPROM_READ(planner.extruder_advance_K);
       #else
         EEPROM_READ(dummy);
-        EEPROM_READ(dummy);
       #endif
 
       //
@@ -1832,8 +1827,7 @@ void MarlinSettings::reset(
   #endif
 
   #if ENABLED(LIN_ADVANCE)
-    planner.extruder_advance_k = LIN_ADVANCE_K;
-    planner.advance_ed_ratio = LIN_ADVANCE_E_D_RATIO;
+    planner.extruder_advance_K = LIN_ADVANCE_K;
   #endif
 
   #if HAS_MOTOR_CURRENT_PWM
@@ -2409,8 +2403,7 @@ void MarlinSettings::reset(
         SERIAL_ECHOLNPGM_P(port, "Linear Advance:");
       }
       CONFIG_ECHO_START;
-      SERIAL_ECHOPAIR_P(port, "  M900 K", planner.extruder_advance_k);
-      SERIAL_ECHOLNPAIR_P(port, " R", planner.advance_ed_ratio);
+      SERIAL_ECHOLNPAIR_P(port, "  M900 K", planner.extruder_advance_K);
     #endif
 
     #if HAS_MOTOR_CURRENT_PWM

Marlin/src/module/planner.cpp

@@ -185,11 +185,8 @@ float Planner::previous_speed[NUM_AXIS],
 #endif
 
 #if ENABLED(LIN_ADVANCE)
-  float Planner::extruder_advance_k, // Initialized by settings.load()
-        Planner::advance_ed_ratio,   // Initialized by settings.load()
-        Planner::position_float[XYZE], // Needed for accurate maths. Steps cannot be used!
-        Planner::lin_dist_xy,
-        Planner::lin_dist_e;
+  float Planner::extruder_advance_K, // Initialized by settings.load()
+        Planner::position_float[XYZE]; // Needed for accurate maths. Steps cannot be used!
 #endif
 
 #if ENABLED(ULTRA_LCD)
@@ -364,6 +361,13 @@ void Planner::recalculate_trapezoids() {
         // NOTE: Entry and exit factors always > 0 by all previous logic operations.
         const float nomr = 1.0 / current->nominal_speed;
         calculate_trapezoid_for_block(current, current->entry_speed * nomr, next->entry_speed * nomr);
+        #if ENABLED(LIN_ADVANCE)
+          if (current->use_advance_lead) {
+            const float comp = current->e_D_ratio * extruder_advance_K * axis_steps_per_mm[E_AXIS];
+            current->max_adv_steps = current->nominal_speed * comp;
+            current->final_adv_steps = next->entry_speed * comp;
+          }
+        #endif
         CBI(current->flag, BLOCK_BIT_RECALCULATE); // Reset current only to ensure next trapezoid is computed
       }
     }
@@ -373,6 +377,13 @@ void Planner::recalculate_trapezoids() {
   if (next) {
     const float nomr = 1.0 / next->nominal_speed;
     calculate_trapezoid_for_block(next, next->entry_speed * nomr, (MINIMUM_PLANNER_SPEED) * nomr);
+    #if ENABLED(LIN_ADVANCE)
+      if (next->use_advance_lead) {
+        const float comp = next->e_D_ratio * extruder_advance_K * axis_steps_per_mm[E_AXIS];
+        next->max_adv_steps = next->nominal_speed * comp;
+        next->final_adv_steps = (MINIMUM_PLANNER_SPEED) * comp;
+      }
+    #endif
     CBI(next->flag, BLOCK_BIT_RECALCULATE);
   }
 }
@@ -730,7 +741,12 @@ void Planner::check_axes_activity() {
  *  fr_mm_s     - (target) speed of the move
  *  extruder    - target extruder
  */
-void Planner::_buffer_steps(const int32_t (&target)[ABCE], float fr_mm_s, const uint8_t extruder, const float &millimeters /*= 0.0*/) {
+void Planner::_buffer_steps(const int32_t (&target)[XYZE]
+  #if ENABLED(LIN_ADVANCE)
+    , const float (&target_float)[XYZE]
+  #endif
+  , float fr_mm_s, const uint8_t extruder, const float &millimeters/*=0.0*/
+) {
 
   const int32_t da = target[A_AXIS] - position[A_AXIS],
                 db = target[B_AXIS] - position[B_AXIS],
@@ -751,13 +767,14 @@ void Planner::_buffer_steps(const int32_t (&target)[ABCE], float fr_mm_s, const
     SERIAL_ECHOLNPGM(" steps)");
   //*/
 
-  // If LIN_ADVANCE is disabled then do E move prevention with integers
-  // Otherwise it's done in _buffer_segment.
-  #if DISABLED(LIN_ADVANCE) && (ENABLED(PREVENT_COLD_EXTRUSION) || ENABLED(PREVENT_LENGTHY_EXTRUDE))
+  #if ENABLED(PREVENT_COLD_EXTRUSION) || ENABLED(PREVENT_LENGTHY_EXTRUDE)
     if (de) {
       #if ENABLED(PREVENT_COLD_EXTRUSION)
         if (thermalManager.tooColdToExtrude(extruder)) {
           position[E_AXIS] = target[E_AXIS]; // Behave as if the move really took place, but ignore E part
+          #if ENABLED(LIN_ADVANCE)
+            position_float[E_AXIS] = target_float[E_AXIS];
+          #endif
           de = 0; // no difference
           SERIAL_ECHO_START();
           SERIAL_ECHOLNPGM(MSG_ERR_COLD_EXTRUDE_STOP);
@@ -766,13 +783,16 @@ void Planner::_buffer_steps(const int32_t (&target)[ABCE], float fr_mm_s, const
       #if ENABLED(PREVENT_LENGTHY_EXTRUDE)
         if (labs(de * e_factor[extruder]) > (int32_t)axis_steps_per_mm[E_AXIS_N] * (EXTRUDE_MAXLENGTH)) { // It's not important to get max. extrusion length in a precision < 1mm, so save some cycles and cast to int
           position[E_AXIS] = target[E_AXIS]; // Behave as if the move really took place, but ignore E part
+          #if ENABLED(LIN_ADVANCE)
+            position_float[E_AXIS] = target_float[E_AXIS];
+          #endif
           de = 0; // no difference
           SERIAL_ECHO_START();
           SERIAL_ECHOLNPGM(MSG_ERR_LONG_EXTRUDE_STOP);
         }
       #endif // PREVENT_LENGTHY_EXTRUDE
     }
-  #endif // !LIN_ADVANCE && (PREVENT_COLD_EXTRUSION || PREVENT_LENGTHY_EXTRUDE)
+  #endif // PREVENT_COLD_EXTRUSION || PREVENT_LENGTHY_EXTRUDE
 
   // Compute direction bit-mask for this block
   uint8_t dm = 0;
@@ -1189,6 +1209,9 @@ void Planner::_buffer_steps(const int32_t (&target)[ABCE], float fr_mm_s, const
   if (!block->steps[A_AXIS] && !block->steps[B_AXIS] && !block->steps[C_AXIS]) {
     // convert to: acceleration steps/sec^2
     accel = CEIL(retract_acceleration * steps_per_mm);
+    #if ENABLED(LIN_ADVANCE)
+      block->use_advance_lead = false;
+    #endif
   }
   else {
     #define LIMIT_ACCEL_LONG(AXIS,INDX) do{ \
@@ -1208,6 +1231,47 @@ void Planner::_buffer_steps(const int32_t (&target)[ABCE], float fr_mm_s, const
     // Start with print or travel acceleration
     accel = CEIL((esteps ? acceleration : travel_acceleration) * steps_per_mm);
 
+    #if ENABLED(LIN_ADVANCE)
+      /**
+       *
+       * Use LIN_ADVANCE for blocks if all these are true:
+       *
+       * esteps             : This is a print move, because we checked for A, B, C steps before.
+       *
+       * extruder_advance_K : There is an advance factor set.
+       *
+       * de > 0             : Extruder is running forward (e.g., for "Wipe while retracting" (Slic3r) or "Combing" (Cura) moves)
+       */
+      block->use_advance_lead =  esteps
+                              && extruder_advance_K
+                              && de > 0;
+
+      if (block->use_advance_lead) {
+        block->e_D_ratio = (target_float[E_AXIS] - position_float[E_AXIS]) /
+          #if IS_KINEMATIC
+            block->millimeters
+          #else
+            SQRT(sq(target_float[X_AXIS] - position_float[X_AXIS])
+               + sq(target_float[Y_AXIS] - position_float[Y_AXIS])
+               + sq(target_float[Z_AXIS] - position_float[Z_AXIS]))
+          #endif
+        ;
+
+        // Check for unusual high e_D ratio to detect if a retract move was combined with the last print move due to min. steps per segment. Never execute this with advance!
+        // This assumes no one will use a retract length of 0mm < retr_length < ~0.2mm and no one will print 100mm wide lines using 3mm filament or 35mm wide lines using 1.75mm filament.
+        if (block->e_D_ratio > 3.0)
+          block->use_advance_lead = false;
+        else {
+          const uint32_t max_accel_steps_per_s2 = max_jerk[E_AXIS] / (extruder_advance_K * block->e_D_ratio) * steps_per_mm;
+          #if ENABLED(LA_DEBUG)
+            if (accel > max_accel_steps_per_s2)
+              SERIAL_ECHOLNPGM("Acceleration limited.");
+          #endif
+          NOMORE(accel, max_accel_steps_per_s2);
+        }
+      }
+    #endif
+
     #if ENABLED(DISTINCT_E_FACTORS)
       #define ACCEL_IDX extruder
     #else
@@ -1230,7 +1294,18 @@ void Planner::_buffer_steps(const int32_t (&target)[ABCE], float fr_mm_s, const
   }
   block->acceleration_steps_per_s2 = accel;
   block->acceleration = accel / steps_per_mm;
-  block->acceleration_rate = (long)(accel * 16777216.0 / (HAL_STEPPER_TIMER_RATE)); // 16777216 = <<24
+  block->acceleration_rate = (long)(accel * 16777216.0 / ((F_CPU) * 0.125)); // * 8.388608
+  #if ENABLED(LIN_ADVANCE)
+    if (block->use_advance_lead) {
+      block->advance_speed = ((F_CPU) * 0.125) / (extruder_advance_K * block->e_D_ratio * block->acceleration * axis_steps_per_mm[E_AXIS_N]);
+      #if ENABLED(LA_DEBUG)
+        if (extruder_advance_K * block->e_D_ratio * block->acceleration * 2 < block->nominal_speed * block->e_D_ratio)
+          SERIAL_ECHOLNPGM("More than 2 steps per eISR loop executed.");
+        if (block->advance_speed < 200)
+          SERIAL_ECHOLNPGM("eISR running at > 10kHz.");
+      #endif
+    }
+  #endif
 
   // Initial limit on the segment entry velocity
   float vmax_junction;
@@ -1386,41 +1461,15 @@ void Planner::_buffer_steps(const int32_t (&target)[ABCE], float fr_mm_s, const
   previous_nominal_speed = block->nominal_speed;
   previous_safe_speed = safe_speed;
 
-  #if ENABLED(LIN_ADVANCE)
-    /**
-     *
-     * Use LIN_ADVANCE for blocks if all these are true:
-     *
-     * esteps && (block->steps[X_AXIS] || block->steps[Y_AXIS]) : This is a print move
-     *
-     * extruder_advance_k                 : There is an advance factor set.
-     *
-     * esteps != block->step_event_count  : A problem occurs if the move before a retract is too small.
-     *                                      In that case, the retract and move will be executed together.
-     *                                      This leads to too many advance steps due to a huge e_acceleration.
-     *                                      The math is good, but we must avoid retract moves with advance!
-     * lin_dist_e > 0                       : Extruder is running forward (e.g., for "Wipe while retracting" (Slic3r) or "Combing" (Cura) moves)
-     */
-    block->use_advance_lead =  esteps && (block->steps[X_AXIS] || block->steps[Y_AXIS])
-                            && extruder_advance_k
-                            && (uint32_t)esteps != block->step_event_count
-                            && lin_dist_e > 0;
-    if (block->use_advance_lead)
-      block->abs_adv_steps_multiplier8 = LROUND(
-        extruder_advance_k
-        * (UNEAR_ZERO(advance_ed_ratio) ? lin_dist_e / lin_dist_xy : advance_ed_ratio) // Use the fixed ratio, if set
-        * (block->nominal_speed / (float)block->nominal_rate)
-        * axis_steps_per_mm[E_AXIS_N] * 256.0
-      );
-
-  #endif // LIN_ADVANCE
-
   // Move buffer head
   block_buffer_head = next_buffer_head;
 
   // Update the position (only when a move was queued)
   static_assert(COUNT(target) > 1, "Parameter to _buffer_steps must be (&target)[XYZE]!");
   COPY(position, target);
+  #if ENABLED(LIN_ADVANCE)
+    COPY(position_float, target_float);
+  #endif
 
   recalculate();
 
@@ -1438,7 +1487,7 @@ void Planner::_buffer_steps(const int32_t (&target)[ABCE], float fr_mm_s, const
  *  extruder    - target extruder
  *  millimeters - the length of the movement, if known
  */
-void Planner::buffer_segment(const float &a, const float &b, const float &c, const float &e, const float &fr_mm_s, const uint8_t extruder, const float &millimeters /*= 0.0*/) {
+void Planner::buffer_segment(const float &a, const float &b, const float &c, const float &e, const float &fr_mm_s, const uint8_t extruder, const float &millimeters/*=0.0*/) {
   // When changing extruders recalculate steps corresponding to the E position
   #if ENABLED(DISTINCT_E_FACTORS)
     if (last_extruder != extruder && axis_steps_per_mm[E_AXIS_N] != axis_steps_per_mm[E_AXIS + last_extruder]) {
@@ -1456,6 +1505,18 @@ void Planner::buffer_segment(const float &a, const float &b, const float &c, con
     LROUND(e * axis_steps_per_mm[E_AXIS_N])
   };
 
+  #if ENABLED(LIN_ADVANCE)
+    const float target_float[XYZE] = { a, b, c, e };
+  #endif
+
+  // DRYRUN prevents E moves from taking place
+  if (DEBUGGING(DRYRUN)) {
+    position[E_AXIS] = target[E_AXIS];
+    #if ENABLED(LIN_ADVANCE)
+      position_float[E_AXIS] = e;
+    #endif
+  }
+
   /* <-- add a slash to enable
     SERIAL_ECHOPAIR("  buffer_segment FR:", fr_mm_s);
     #if IS_KINEMATIC
@@ -1484,85 +1545,48 @@ void Planner::buffer_segment(const float &a, const float &b, const float &c, con
     SERIAL_ECHOLNPGM(")");
   //*/
 
-  // DRYRUN prevents E moves from taking place
-  if (DEBUGGING(DRYRUN)) {
-    position[E_AXIS] = target[E_AXIS];
-    #if ENABLED(LIN_ADVANCE)
-      position_float[E_AXIS] = e;
-    #endif
-  }
-
-  #if ENABLED(LIN_ADVANCE)
-    lin_dist_e = e - position_float[E_AXIS];
-  #endif
-
-  // If LIN_ADVANCE is enabled then do E move prevention with floats
-  // Otherwise it's done in _buffer_steps.
-  #if ENABLED(LIN_ADVANCE) && (ENABLED(PREVENT_COLD_EXTRUSION) || ENABLED(PREVENT_LENGTHY_EXTRUDE))
-    if (lin_dist_e) {
-      #if ENABLED(PREVENT_COLD_EXTRUSION)
-        if (thermalManager.tooColdToExtrude(extruder)) {
-          position_float[E_AXIS] = e; // Behave as if the move really took place, but ignore E part
-          position[E_AXIS] = target[E_AXIS];
-          lin_dist_e = 0;
-          SERIAL_ECHO_START();
-          SERIAL_ECHOLNPGM(MSG_ERR_COLD_EXTRUDE_STOP);
-        }
-      #endif // PREVENT_COLD_EXTRUSION
-      #if ENABLED(PREVENT_LENGTHY_EXTRUDE)
-        if (lin_dist_e * e_factor[extruder] > (EXTRUDE_MAXLENGTH)) {
-          position_float[E_AXIS] = e; // Behave as if the move really took place, but ignore E part
-          position[E_AXIS] = target[E_AXIS];
-          lin_dist_e = 0;
-          SERIAL_ECHO_START();
-          SERIAL_ECHOLNPGM(MSG_ERR_LONG_EXTRUDE_STOP);
-        }
-      #endif // PREVENT_LENGTHY_EXTRUDE
-    }
-  #endif // LIN_ADVANCE && (PREVENT_COLD_EXTRUSION || PREVENT_LENGTHY_EXTRUDE)
-
-  #if ENABLED(LIN_ADVANCE)
-    if (lin_dist_e > 0)
-      lin_dist_xy = HYPOT(a - position_float[X_AXIS], b - position_float[Y_AXIS]);
-  #endif
-
   // Always split the first move into two (if not homing or probing)
   if (!blocks_queued()) {
 
     #define _BETWEEN(A) (position[A##_AXIS] + target[A##_AXIS]) >> 1
     const int32_t between[ABCE] = { _BETWEEN(A), _BETWEEN(B), _BETWEEN(C), _BETWEEN(E) };
-    DISABLE_STEPPER_DRIVER_INTERRUPT();
 
     #if ENABLED(LIN_ADVANCE)
-      lin_dist_xy *= 0.5;
-      lin_dist_e *= 0.5;
+      #define _BETWEEN_F(A) (position_float[A##_AXIS] + target_float[A##_AXIS]) * 0.5
+      const float between_float[ABCE] = { _BETWEEN_F(A), _BETWEEN_F(B), _BETWEEN_F(C), _BETWEEN_F(E) };
     #endif
 
-    _buffer_steps(between, fr_mm_s, extruder, millimeters * 0.5);
+    DISABLE_STEPPER_DRIVER_INTERRUPT();
 
-    #if ENABLED(LIN_ADVANCE)
-      position_float[X_AXIS] = (position_float[X_AXIS] + a) * 0.5;
-      position_float[Y_AXIS] = (position_float[Y_AXIS] + b) * 0.5;
-      //position_float[Z_AXIS] = (position_float[Z_AXIS] + c) * 0.5;
-      position_float[E_AXIS] = (position_float[E_AXIS] + e) * 0.5;
-    #endif
+    _buffer_steps(between
+      #if ENABLED(LIN_ADVANCE)
+        , between_float
+      #endif
+      , fr_mm_s, extruder, millimeters * 0.5
+    );
 
     const uint8_t next = block_buffer_head;
-    _buffer_steps(target, fr_mm_s, extruder, millimeters * 0.5);
+
+    _buffer_steps(target
+      #if ENABLED(LIN_ADVANCE)
+        , target_float
+      #endif
+      , fr_mm_s, extruder, millimeters * 0.5
+    );
+
     SBI(block_buffer[next].flag, BLOCK_BIT_CONTINUED);
     ENABLE_STEPPER_DRIVER_INTERRUPT();
   }
   else
-    _buffer_steps(target, fr_mm_s, extruder, millimeters);
+    _buffer_steps(target
+      #if ENABLED(LIN_ADVANCE)
+        , target_float
+      #endif
+      , fr_mm_s, extruder, millimeters
+    );
 
   stepper.wake_up();
 
-  #if ENABLED(LIN_ADVANCE)
-    position_float[X_AXIS] = a;
-    position_float[Y_AXIS] = b;
-    //position_float[Z_AXIS] = c;
-    position_float[E_AXIS] = e;
-  #endif
 } // buffer_segment()
 
 /**
@@ -1586,7 +1610,7 @@ void Planner::_set_position_mm(const float &a, const float &b, const float &c, c
   #if ENABLED(LIN_ADVANCE)
     position_float[X_AXIS] = a;
     position_float[Y_AXIS] = b;
-    //position_float[Z_AXIS] = c;
+    position_float[Z_AXIS] = c;
     position_float[E_AXIS] = e;
   #endif
   stepper.set_position(na, nb, nc, ne);

Marlin/src/module/planner.h

@@ -103,7 +103,10 @@ typedef struct {
   // Advance extrusion
   #if ENABLED(LIN_ADVANCE)
     bool use_advance_lead;
-    uint32_t abs_adv_steps_multiplier8; // Factorised by 2^8 to avoid float
+    uint16_t advance_speed,                 // Timer value for extruder speed offset
+             max_adv_steps,                 // max. advance steps to get cruising speed pressure (not always nominal_speed!)
+             final_adv_steps;               // advance steps due to exit speed
+    float e_D_ratio;
   #endif
 
   // Fields used by the motion planner to manage acceleration
@@ -195,9 +198,8 @@ class Planner {
     #endif
 
     #if ENABLED(LIN_ADVANCE)
-      static float extruder_advance_k, advance_ed_ratio,
-                   position_float[XYZE],
-                   lin_dist_xy, lin_dist_e;
+      static float extruder_advance_K,
+                   position_float[XYZE];
     #endif
 
     #if ENABLED(SKEW_CORRECTION)
@@ -418,7 +420,12 @@ class Planner {
      *  extruder    - target extruder
      *  millimeters - the length of the movement, if known
      */
-    static void _buffer_steps(const int32_t (&target)[XYZE], float fr_mm_s, const uint8_t extruder, const float &millimeters = 0.0);
+    static void _buffer_steps(const int32_t (&target)[XYZE]
+      #if ENABLED(LIN_ADVANCE)
+        , const float (&target_float)[XYZE]
+      #endif
+      , float fr_mm_s, const uint8_t extruder, const float &millimeters=0.0
+    );
 
     /**
      * Planner::buffer_segment
@@ -432,7 +439,7 @@ class Planner {
      *  extruder    - target extruder
      *  millimeters - the length of the movement, if known
      */
-    static void buffer_segment(const float &a, const float &b, const float &c, const float &e, const float &fr_mm_s, const uint8_t extruder, const float &millimeters = 0.0);
+    static void buffer_segment(const float &a, const float &b, const float &c, const float &e, const float &fr_mm_s, const uint8_t extruder, const float &millimeters=0.0);
 
     static void _set_position_mm(const float &a, const float &b, const float &c, const float &e);
 

Marlin/src/module/stepper.cpp

@@ -111,31 +111,21 @@ volatile uint32_t Stepper::step_events_completed = 0; // The number of step even
 
 #if ENABLED(LIN_ADVANCE)
 
+  uint32_t Stepper::LA_decelerate_after;
+
   constexpr hal_timer_t ADV_NEVER = HAL_TIMER_TYPE_MAX;
 
   hal_timer_t Stepper::nextMainISR = 0,
               Stepper::nextAdvanceISR = ADV_NEVER,
               Stepper::eISR_Rate = ADV_NEVER;
+  uint16_t Stepper::current_adv_steps = 0,
+           Stepper::final_adv_steps,
+           Stepper::max_adv_steps;
 
-  volatile int Stepper::e_steps[E_STEPPERS];
-  int Stepper::final_estep_rate,
-      Stepper::current_estep_rate[E_STEPPERS],
-      Stepper::current_adv_steps[E_STEPPERS];
+  int8_t Stepper::e_steps = 0,
+         Stepper::LA_active_extruder; // Copy from current executed block. Needed because current_block is set to NULL "too early".
 
-  /**
-   * See https://github.com/MarlinFirmware/Marlin/issues/5699#issuecomment-309264382
-   *
-   * This fix isn't perfect and may lose steps - but better than locking up completely
-   * in future the planner should slow down if advance stepping rate would be too high
-   */
-  FORCE_INLINE hal_timer_t adv_rate(const int steps, const hal_timer_t timer, const uint8_t loops) {
-    if (steps) {
-      const hal_timer_t rate = (timer * loops) / abs(steps);
-      //return constrain(rate, 1, ADV_NEVER - 1)
-      return rate ? rate : 1;
-    }
-    return ADV_NEVER;
-  }
+  bool Stepper::use_advance_lead;
 
 #endif // LIN_ADVANCE
 
@@ -461,7 +451,7 @@ void Stepper::isr() {
         #if DISABLED(MIXING_EXTRUDER)
           // Don't step E here for mixing extruder
           count_position[E_AXIS] += count_direction[E_AXIS];
-          motor_direction(E_AXIS) ? --e_steps[TOOL_E_INDEX] : ++e_steps[TOOL_E_INDEX];
+          motor_direction(E_AXIS) ? --e_steps : ++e_steps;
         #endif
       }
 
@@ -640,25 +630,6 @@ void Stepper::isr() {
 
   } // steps_loop
 
-  #if ENABLED(LIN_ADVANCE)
-
-    if (current_block->use_advance_lead) {
-      const int delta_adv_steps = current_estep_rate[TOOL_E_INDEX] - current_adv_steps[TOOL_E_INDEX];
-      current_adv_steps[TOOL_E_INDEX] += delta_adv_steps;
-      #if ENABLED(MIXING_EXTRUDER)
-        // Mixing extruders apply advance lead proportionally
-        MIXING_STEPPERS_LOOP(j)
-          e_steps[j] += delta_adv_steps * current_block->step_event_count / current_block->mix_event_count[j];
-      #else
-        // For most extruders, advance the single E stepper
-        e_steps[TOOL_E_INDEX] += delta_adv_steps;
-      #endif
-    }
-    // If we have esteps to execute, fire the next advance_isr "now"
-    if (e_steps[TOOL_E_INDEX]) nextAdvanceISR = 0;
-
-  #endif // LIN_ADVANCE
-
   // Calculate new timer value
   if (step_events_completed <= (uint32_t)current_block->accelerate_until) {
 
@@ -683,14 +654,15 @@ void Stepper::isr() {
     #if ENABLED(LIN_ADVANCE)
 
       if (current_block->use_advance_lead) {
-        #if ENABLED(MIXING_EXTRUDER)
-          MIXING_STEPPERS_LOOP(j)
-            current_estep_rate[j] = ((uint32_t)acc_step_rate * current_block->abs_adv_steps_multiplier8 * current_block->step_event_count / current_block->mix_event_count[j]) >> 17;
-        #else
-          current_estep_rate[TOOL_E_INDEX] = ((uint32_t)acc_step_rate * current_block->abs_adv_steps_multiplier8) >> 17;
-        #endif
+        if (step_events_completed == step_loops || (e_steps && eISR_Rate != current_block->advance_speed)) {
+          nextAdvanceISR = 0; // Wake up eISR on first acceleration loop and fire ISR if final adv_rate is reached
+          eISR_Rate = current_block->advance_speed;
+        }
+      }
+      else {
+        eISR_Rate = ADV_NEVER;
+        if (e_steps) nextAdvanceISR = 0;
       }
-      eISR_Rate = adv_rate(e_steps[TOOL_E_INDEX], interval, step_loops);
 
     #endif // LIN_ADVANCE
   }
@@ -719,14 +691,15 @@ void Stepper::isr() {
     #if ENABLED(LIN_ADVANCE)
 
       if (current_block->use_advance_lead) {
-        #if ENABLED(MIXING_EXTRUDER)
-          MIXING_STEPPERS_LOOP(j)
-            current_estep_rate[j] = ((uint32_t)step_rate * current_block->abs_adv_steps_multiplier8 * current_block->step_event_count / current_block->mix_event_count[j]) >> 17;
-        #else
-          current_estep_rate[TOOL_E_INDEX] = ((uint32_t)step_rate * current_block->abs_adv_steps_multiplier8) >> 17;
-        #endif
+        if (step_events_completed <= (uint32_t)current_block->decelerate_after + step_loops || (e_steps && eISR_Rate != current_block->advance_speed)) {
+          nextAdvanceISR = 0; // Wake up eISR on first deceleration loop
+          eISR_Rate = current_block->advance_speed;
+        }
+      }
+      else {
+        eISR_Rate = ADV_NEVER;
+        if (e_steps) nextAdvanceISR = 0;
       }
-      eISR_Rate = adv_rate(e_steps[TOOL_E_INDEX], interval, step_loops);
 
     #endif // LIN_ADVANCE
   }
@@ -734,10 +707,8 @@ void Stepper::isr() {
 
     #if ENABLED(LIN_ADVANCE)
 
-      if (current_block->use_advance_lead)
-        current_estep_rate[TOOL_E_INDEX] = final_estep_rate;
-
-      eISR_Rate = adv_rate(e_steps[TOOL_E_INDEX], OCR1A_nominal, step_loops_nominal);
+      // If we have esteps to execute, fire the next advance_isr "now"
+      if (e_steps && eISR_Rate != current_block->advance_speed) nextAdvanceISR = 0;
 
     #endif
 
@@ -781,55 +752,79 @@ void Stepper::isr() {
     #if ENABLED(MK2_MULTIPLEXER)
       // Even-numbered steppers are reversed
       #define SET_E_STEP_DIR(INDEX) \
-        if (e_steps[INDEX]) E## INDEX ##_DIR_WRITE(e_steps[INDEX] < 0 ? !INVERT_E## INDEX ##_DIR ^ TEST(INDEX, 0) : INVERT_E## INDEX ##_DIR ^ TEST(INDEX, 0))
+        if (e_steps) E## INDEX ##_DIR_WRITE(e_steps < 0 ? !INVERT_E## INDEX ##_DIR ^ TEST(INDEX, 0) : INVERT_E## INDEX ##_DIR ^ TEST(INDEX, 0))
     #else
       #define SET_E_STEP_DIR(INDEX) \
-        if (e_steps[INDEX]) E## INDEX ##_DIR_WRITE(e_steps[INDEX] < 0 ? INVERT_E## INDEX ##_DIR : !INVERT_E## INDEX ##_DIR)
+        if (e_steps) E## INDEX ##_DIR_WRITE(e_steps < 0 ? INVERT_E## INDEX ##_DIR : !INVERT_E## INDEX ##_DIR)
     #endif
 
     #define START_E_PULSE(INDEX) \
-      if (e_steps[INDEX]) E## INDEX ##_STEP_WRITE(!INVERT_E_STEP_PIN)
+      if (e_steps) E## INDEX ##_STEP_WRITE(!INVERT_E_STEP_PIN)
 
     #define STOP_E_PULSE(INDEX) \
-      if (e_steps[INDEX]) { \
-        e_steps[INDEX] < 0 ? ++e_steps[INDEX] : --e_steps[INDEX]; \
+      if (e_steps) { \
+        e_steps < 0 ? ++e_steps : --e_steps; \
         E## INDEX ##_STEP_WRITE(INVERT_E_STEP_PIN); \
       }
 
-    SET_E_STEP_DIR(0);
-    #if E_STEPPERS > 1
-      SET_E_STEP_DIR(1);
-      #if E_STEPPERS > 2
-        SET_E_STEP_DIR(2);
-        #if E_STEPPERS > 3
-          SET_E_STEP_DIR(3);
-          #if E_STEPPERS > 4
-            SET_E_STEP_DIR(4);
-          #endif
-        #endif
-      #endif
-    #endif
+    if (current_block->use_advance_lead) {
+      if (step_events_completed > LA_decelerate_after && current_adv_steps > final_adv_steps) {
+        e_steps--;
+        current_adv_steps--;
+        nextAdvanceISR = eISR_Rate;
+      }
+      else if (step_events_completed < LA_decelerate_after && current_adv_steps < max_adv_steps) {
+             //step_events_completed <= (uint32_t)current_block->accelerate_until) {
+        e_steps++;
+        current_adv_steps++;
+        nextAdvanceISR = eISR_Rate;
+      }
+      else {
+        nextAdvanceISR = ADV_NEVER;
+        eISR_Rate = ADV_NEVER;
+      }
+    }
+    else
+      nextAdvanceISR = ADV_NEVER;
+
+    switch(LA_active_extruder) {
+      case 0: SET_E_STEP_DIR(0); break;
+      #if EXTRUDERS > 1
+        case 1: SET_E_STEP_DIR(1); break;
+        #if EXTRUDERS > 2
+          case 2: SET_E_STEP_DIR(2); break;
+          #if EXTRUDERS > 3
+            case 3: SET_E_STEP_DIR(3); break;
+            #if EXTRUDERS > 4
+              case 4: SET_E_STEP_DIR(4); break;
+            #endif // EXTRUDERS > 4
+          #endif // EXTRUDERS > 3
+        #endif // EXTRUDERS > 2
+      #endif // EXTRUDERS > 1
+    }
 
-    // Step all E steppers that have steps
-    for (uint8_t i = step_loops; i--;) {
+    // Step E stepper if we have steps
+    while (e_steps) {
 
       #if EXTRA_CYCLES_E > 20
         hal_timer_t pulse_start = HAL_timer_get_count(PULSE_TIMER_NUM);
       #endif
 
-      START_E_PULSE(0);
-      #if E_STEPPERS > 1
-        START_E_PULSE(1);
-        #if E_STEPPERS > 2
-          START_E_PULSE(2);
-          #if E_STEPPERS > 3
-            START_E_PULSE(3);
-            #if E_STEPPERS > 4
-              START_E_PULSE(4);
-            #endif
-          #endif
-        #endif
-      #endif
+      switch(LA_active_extruder) {
+        case 0: START_E_PULSE(0); break;
+        #if EXTRUDERS > 1
+          case 1: START_E_PULSE(1); break;
+          #if EXTRUDERS > 2
+            case 2: START_E_PULSE(2); break;
+            #if EXTRUDERS > 3
+              case 3: START_E_PULSE(3); break;
+              #if EXTRUDERS > 4
+                case 4: START_E_PULSE(4); break;
+              #endif // EXTRUDERS > 4
+            #endif // EXTRUDERS > 3
+          #endif // EXTRUDERS > 2
+        #endif // EXTRUDERS > 1
+      }
 
       // For minimum pulse time wait before stopping pulses
       #if EXTRA_CYCLES_E > 20
@@ -839,19 +834,21 @@ void Stepper::isr() {
         DELAY_NOPS(EXTRA_CYCLES_E);
       #endif
 
-      STOP_E_PULSE(0);
-      #if E_STEPPERS > 1
-        STOP_E_PULSE(1);
-        #if E_STEPPERS > 2
-          STOP_E_PULSE(2);
-          #if E_STEPPERS > 3
-            STOP_E_PULSE(3);
-            #if E_STEPPERS > 4
-              STOP_E_PULSE(4);
-            #endif
-          #endif
-        #endif
-      #endif
+      switch(LA_active_extruder) {
+        case 0: STOP_E_PULSE(0); break;
+        #if EXTRUDERS > 1
+          case 1: STOP_E_PULSE(1); break;
+          #if EXTRUDERS > 2
+            case 2: STOP_E_PULSE(2); break;
+            #if EXTRUDERS > 3
+              case 3: STOP_E_PULSE(3); break;
+              #if EXTRUDERS > 4
+                case 4: STOP_E_PULSE(4); break;
+              #endif // EXTRUDERS > 4
+            #endif // EXTRUDERS > 3
+          #endif // EXTRUDERS > 2
+        #endif // EXTRUDERS > 1
+      }
 
       // For minimum pulse time wait before looping
       #if EXTRA_CYCLES_E > 20
@@ -1116,11 +1113,6 @@ void Stepper::init() {
 
   ENABLE_STEPPER_DRIVER_INTERRUPT();
 
-  #if ENABLED(LIN_ADVANCE)
-    for (uint8_t i = 0; i < COUNT(e_steps); i++) e_steps[i] = 0;
-    ZERO(current_adv_steps);
-  #endif
-
   endstops.enable(true); // Start with endstops active. After homing they can be disabled
   sei();
 

Marlin/src/module/stepper.h

@@ -98,18 +98,20 @@ class Stepper {
     static volatile uint32_t step_events_completed; // The number of step events executed in the current block
 
     #if ENABLED(LIN_ADVANCE)
+
+      static uint32_t LA_decelerate_after; // Copy from current executed block. Needed because current_block is set to NULL "too early".
       static hal_timer_t nextMainISR, nextAdvanceISR, eISR_Rate;
+      static uint16_t current_adv_steps, final_adv_steps, max_adv_steps; // Copy from current executed block. Needed because current_block is set to NULL "too early".
       #define _NEXT_ISR(T) nextMainISR = T
+      static int8_t e_steps;
+      static int8_t LA_active_extruder; // Copy from current executed block. Needed because current_block is set to NULL "too early".
+      static bool use_advance_lead;
+
+    #else // !LIN_ADVANCE
 
-      static volatile int e_steps[E_STEPPERS];
-      static int final_estep_rate;
-      static int current_estep_rate[E_STEPPERS]; // Actual extruder speed [steps/s]
-      static int current_adv_steps[E_STEPPERS];  // The amount of current added esteps due to advance.
-                                                 // i.e., the current amount of pressure applied
-                                                 // to the spring (=filament).
-    #else
       #define _NEXT_ISR(T) HAL_timer_set_compare(STEP_TIMER_NUM, T);
-    #endif // LIN_ADVANCE
+
+    #endif // !LIN_ADVANCE
 
     static long acceleration_time, deceleration_time;
     static uint8_t step_loops, step_loops_nominal;
@@ -239,13 +241,11 @@ class Stepper {
       FORCE_INLINE static void set_x_lock(const bool state) { locked_x_motor = state; }
       FORCE_INLINE static void set_x2_lock(const bool state) { locked_x2_motor = state; }
     #endif
-
     #if ENABLED(Y_DUAL_ENDSTOPS)
       FORCE_INLINE static void set_homing_flag_y(const bool state) { performing_homing = state; }
       FORCE_INLINE static void set_y_lock(const bool state) { locked_y_motor = state; }
       FORCE_INLINE static void set_y2_lock(const bool state) { locked_y2_motor = state; }
     #endif
-
     #if ENABLED(Z_DUAL_ENDSTOPS)
       FORCE_INLINE static void set_homing_flag_z(const bool state) { performing_homing = state; }
       FORCE_INLINE static void set_z_lock(const bool state) { locked_z_motor = state; }
@@ -351,6 +351,22 @@ class Stepper {
 
       static int8_t last_extruder = -1;
 
+      #if ENABLED(LIN_ADVANCE)
+        if (current_block->active_extruder != last_extruder) {
+          current_adv_steps = 0; // If the now active extruder wasn't in use during the last move, its pressure is most likely gone.
+          LA_active_extruder = current_block->active_extruder;
+        }
+
+        if (current_block->use_advance_lead) {
+          LA_decelerate_after = current_block->decelerate_after;
+          final_adv_steps = current_block->final_adv_steps;
+          max_adv_steps = current_block->max_adv_steps;
+          use_advance_lead = true;
+        }
+        else
+          use_advance_lead = false;
+      #endif
+
       if (current_block->direction_bits != last_direction_bits || current_block->active_extruder != last_extruder) {
         last_direction_bits = current_block->direction_bits;
         last_extruder = current_block->active_extruder;
@@ -366,22 +382,6 @@ class Stepper {
       acceleration_time = calc_timer_interval(acc_step_rate);
       _NEXT_ISR(acceleration_time);
 
-      #if ENABLED(LIN_ADVANCE)
-        if (current_block->use_advance_lead) {
-          current_estep_rate[current_block->active_extruder] = ((unsigned long)acc_step_rate * current_block->abs_adv_steps_multiplier8) >> 17;
-          final_estep_rate = (current_block->nominal_rate * current_block->abs_adv_steps_multiplier8) >> 17;
-        }
-      #endif
-
-      // SERIAL_ECHO_START();
-      // SERIAL_ECHOPGM("advance :");
-      // SERIAL_ECHO(current_block->advance/256.0);
-      // SERIAL_ECHOPGM("advance rate :");
-      // SERIAL_ECHO(current_block->advance_rate/256.0);
-      // SERIAL_ECHOPGM("initial advance :");
-      // SERIAL_ECHO(current_block->initial_advance/256.0);
-      // SERIAL_ECHOPGM("final advance :");
-      // SERIAL_ECHOLN(current_block->final_advance/256.0);
     }
 
     #if HAS_DIGIPOTSS || HAS_MOTOR_CURRENT_PWM