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Merge pull request #5934 from thinkyhead/rc_advance_ed_ratio

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LIN_ADVANCE: Fixed E/D ratio option
master
Scott Lahteine 8 years ago committed by GitHub
parent 903808bb97 b3e2bd6f29
commit 5065636023
20 changed files with 454 additions and 14 deletions
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25
Marlin/Configuration_adv.h
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@ -592,6 +592,31 @@
#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 `M905` to override this value.
*
* Example: `M905 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
*
* Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
*
* Slic3r (including Prusa Slic3r) 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
#endif
// @section leveling

19
Marlin/Marlin_main.cpp
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@ -7601,7 +7601,24 @@ inline void gcode_M503() {
*/
inline void gcode_M905() {
stepper.synchronize();
planner.advance_M905(code_seen('K') ? code_value_float() : -1.0);
const float newK = code_seen('K') ? code_value_float() : -1,
newD = code_seen('D') ? code_value_float() : -1,
newW = code_seen('W') ? code_value_float() : -1,
newH = code_seen('H') ? code_value_float() : -1;
if (newK >= 0.0) planner.set_extruder_advance_k(newK);
SERIAL_ECHO_START;
SERIAL_ECHOLNPAIR("Advance factor: ", planner.get_extruder_advance_k());
if (newD >= 0 || newW >= 0 || newH >= 0) {
const float ratio = (!newD || !newW || !newH) ? 0 : (newW * newH) / (sq(newD * 0.5) * M_PI);
planner.set_advance_ed_ratio(ratio);
SERIAL_ECHO_START;
SERIAL_ECHOPGM("E/D ratio: ");
if (ratio) SERIAL_ECHOLN(ratio); else SERIAL_ECHOLNPGM("Automatic");
}
}
#endif

25
Marlin/example_configurations/Cartesio/Configuration_adv.h
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@ -589,6 +589,31 @@
#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 `M905` to override this value.
*
* Example: `M905 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
*
* Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
*
* Slic3r (including Prusa Slic3r) 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
#endif
// @section leveling

25
Marlin/example_configurations/Felix/Configuration_adv.h
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@ -589,6 +589,31 @@
#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 `M905` to override this value.
*
* Example: `M905 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
*
* Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
*
* Slic3r (including Prusa Slic3r) 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
#endif
// @section leveling

25
Marlin/example_configurations/Hephestos/Configuration_adv.h
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@ -589,6 +589,31 @@
#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 `M905` to override this value.
*
* Example: `M905 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
*
* Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
*
* Slic3r (including Prusa Slic3r) 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
#endif
// @section leveling

25
Marlin/example_configurations/Hephestos_2/Configuration_adv.h
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@ -572,6 +572,31 @@
#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 `M905` to override this value.
*
* Example: `M905 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
*
* Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
*
* Slic3r (including Prusa Slic3r) 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
#endif
// @section leveling

25
Marlin/example_configurations/K8200/Configuration_adv.h
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@ -602,6 +602,31 @@
#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 `M905` to override this value.
*
* Example: `M905 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
*
* Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
*
* Slic3r (including Prusa Slic3r) 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
#endif
// @section leveling

25
Marlin/example_configurations/K8400/Configuration_adv.h
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@ -589,6 +589,31 @@
#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 `M905` to override this value.
*
* Example: `M905 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
*
* Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
*
* Slic3r (including Prusa Slic3r) 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
#endif
// @section leveling

25
Marlin/example_configurations/RigidBot/Configuration_adv.h
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@ -589,6 +589,31 @@
#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 `M905` to override this value.
*
* Example: `M905 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
*
* Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
*
* Slic3r (including Prusa Slic3r) 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
#endif
// @section leveling

25
Marlin/example_configurations/SCARA/Configuration_adv.h
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@ -589,6 +589,31 @@
#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 `M905` to override this value.
*
* Example: `M905 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
*
* Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
*
* Slic3r (including Prusa Slic3r) 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
#endif
// @section leveling

25
Marlin/example_configurations/TAZ4/Configuration_adv.h
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@ -597,6 +597,31 @@
#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 `M905` to override this value.
*
* Example: `M905 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
*
* Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
*
* Slic3r (including Prusa Slic3r) 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
#endif
// @section leveling

25
Marlin/example_configurations/WITBOX/Configuration_adv.h
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@ -589,6 +589,31 @@
#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 `M905` to override this value.
*
* Example: `M905 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
*
* Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
*
* Slic3r (including Prusa Slic3r) 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
#endif
// @section leveling

25
Marlin/example_configurations/delta/generic/Configuration_adv.h
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@ -591,6 +591,31 @@
#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 `M905` to override this value.
*
* Example: `M905 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
*
* Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
*
* Slic3r (including Prusa Slic3r) 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
#endif
// @section leveling

25
Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h
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@ -591,6 +591,31 @@
#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 `M905` to override this value.
*
* Example: `M905 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
*
* Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
*
* Slic3r (including Prusa Slic3r) 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
#endif
// @section leveling

25
Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h
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@ -596,6 +596,31 @@
#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 `M905` to override this value.
*
* Example: `M905 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
*
* Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
*
* Slic3r (including Prusa Slic3r) 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
#endif
// @section leveling

25
Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h
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@ -591,6 +591,31 @@
#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 `M905` to override this value.
*
* Example: `M905 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
*
* Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
*
* Slic3r (including Prusa Slic3r) 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
#endif
// @section leveling

25
Marlin/example_configurations/makibox/Configuration_adv.h
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@ -589,6 +589,31 @@
#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 `M905` to override this value.
*
* Example: `M905 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
*
* Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
*
* Slic3r (including Prusa Slic3r) 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
#endif
// @section leveling

25
Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h
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@ -589,6 +589,31 @@
#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 `M905` to override this value.
*
* Example: `M905 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
*
* Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
*
* Slic3r (including Prusa Slic3r) 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
#endif
// @section leveling

19
Marlin/planner.cpp
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@ -142,6 +142,7 @@ float Planner::previous_speed[NUM_AXIS],
#if ENABLED(LIN_ADVANCE)
float Planner::extruder_advance_k = LIN_ADVANCE_K,
Planner::advance_ed_ratio = LIN_ADVANCE_E_D_RATIO,
Planner::position_float[NUM_AXIS] = { 0 };
#endif
@ -1324,7 +1325,12 @@ void Planner::_buffer_line(const float &a, const float &b, const float &c, const
&& (uint32_t)esteps != block->step_event_count
&& de_float > 0.0;
if (block->use_advance_lead)
block->abs_adv_steps_multiplier8 = lround(extruder_advance_k * (de_float / mm_D_float) * block->nominal_speed / (float)block->nominal_rate * axis_steps_per_mm[E_AXIS_N] * 256.0);
block->abs_adv_steps_multiplier8 = lround(
extruder_advance_k
* (UNEAR_ZERO(advance_ed_ratio) ? de_float / mm_D_float : 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
);
#elif ENABLED(ADVANCE)
@ -1478,14 +1484,3 @@ void Planner::refresh_positioning() {
}
#endif
#if ENABLED(LIN_ADVANCE)
void Planner::advance_M905(const float &k) {
if (k >= 0.0) extruder_advance_k = k;
SERIAL_ECHO_START;
SERIAL_ECHOPAIR("Advance factor: ", extruder_advance_k);
SERIAL_EOL;
}
#endif

5
Marlin/planner.h
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@ -210,6 +210,7 @@ class Planner {
#if ENABLED(LIN_ADVANCE)
static float position_float[NUM_AXIS];
static float extruder_advance_k;
static float advance_ed_ratio;
#endif
#if ENABLED(ULTRA_LCD)
@ -266,7 +267,9 @@ class Planner {
#endif
#if ENABLED(LIN_ADVANCE)
void advance_M905(const float &k);
static void set_extruder_advance_k(const float &k) { extruder_advance_k = k; };
static float get_extruder_advance_k() { return extruder_advance_k; };
static void set_advance_ed_ratio(const float &ratio) { advance_ed_ratio = ratio; };
#endif
/**

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