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Update PurgeLinesAndUnload.py
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This change adds a setting for "minimum Z height" for the "nail down the string" moves.

Update PurgeLinesAndUnload.py

Bug fix.  The prime blob code didn't account for the retraction at the end.  This adds an 'unretract' to compensate.
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@GregValiant
GregValiant committed Feb 27, 2025
1 parent 78ba8d8 commit acfcf6d
Showing 1 changed file with 40 additions and 4 deletions.
44 changes: 40 additions & 4 deletions plugins/PostProcessingPlugin/scripts/PurgeLinesAndUnload.py
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Original file line number Diff line number Diff line change
Expand Up @@ -163,11 +163,21 @@ def getSettingDataString(self):
"move_to_start":
{
"label": "Circle around to layer start ⚠️​",
"description": "Depending on where the 'Layer Start X' and 'Layer Start Y' are for the print, the opening travel move can pass across the print area and leave a string there. This option will generate an orthogonal path that moves the nozzle around the edges of the build plate and then comes in to the Start Point. || ⚠️​ || The nozzle will drop to Z0.0 and touch the build plate at each stop in order to 'nail down the string' so it doesn't follow in a straight line.",
"description": "Depending on where the 'Layer Start X' and 'Layer Start Y' are for the print, the opening travel move can pass across the print area and leave a string there. This option will generate an orthogonal path that moves the nozzle around the edges of the build plate and then comes in to the Start Point. || ⚠️​ || The nozzle can drop to Z0.0 and touch the build plate at each stop in order to 'nail down the string'. The nozzle always raises after the touch-down. It will not drag on the bed.",
"type": "bool",
"default_value": false,
"enabled": true
},
"move_to_start_min_z":
{
"label": " Minimum Z height ⚠️​",
"description": "When moving to the start position, the nozzle can touch down on the build plate at each stop (Z = 0.0). That will stick the string to the build plate at each direction change so it doesn't pull across the print area. Some printers may not respond well to Z=0.0. You may set a minimum Z height here (min is 0.0 and max is 0.50). The string must stick or it defeats the purpose of moving around the periphery.",
"type": "float",
"default_value": 0.0,
"minimum_value": 0.0,
"maximum_value": 0.5,
"enabled": "move_to_start"
},
"adjust_starting_e":
{
"label": "Adjust Starting E location",
Expand Down Expand Up @@ -254,7 +264,9 @@ def execute(self, data):
self.prime_blob_distance = self.getSettingValueByKey("prime_blob_distance")
else:
self.prime_blob_distance = 0

# Set the minimum Z to stick the string to the build plate when Move to Start is selected.
self.touchdown_z = self.getSettingValueByKey("move_to_start_min_z")

# Mapping settings to corresponding methods
procedures = {
"add_purge_lines": self._add_purge_lines,
Expand Down Expand Up @@ -385,7 +397,7 @@ def _move_to_location(self, location_name: str, location: tuple) -> str:
def add_move(axis: str, position: float) -> None:
moves.append(
f"G0 F{self.speed_travel} {axis}{position} ; Start move\n"
f"G0 F600 Z0 ; Nail down the string\n"
f"G0 F600 Z{self.touchdown_z} ; Nail down the string\n"
f"G0 F600 Z2 ; Move up\n"
)

Expand Down Expand Up @@ -494,6 +506,9 @@ def calculate_purge_volume(line_width, purge_length, volume_per_mm):
# Travel to the purge start
purge_str += f"G0 F{self.speed_travel} X{self.machine_left + self.border_distance} Y{self.machine_front + 10} ; Move to start\n"
purge_str += f"G0 F600 Z0.3 ; Move down\n"
if self.prime_blob_enable:
purge_str += f"G1 F{self.retract_speed} E{self.retract_dist} ; Unretract\n"
purge_str += "G92 E0 ; Reset extruder\n"
# Purge two lines
purge_str += f"G1 F{self.print_speed} X{self.machine_left + self.border_distance} Y{y_stop} E{purge_volume} ; First line\n"
purge_str += f"G0 X{self.machine_left + 3 + self.border_distance} Y{y_stop} ; Move over\n"
Expand All @@ -513,6 +528,9 @@ def calculate_purge_volume(line_width, purge_length, volume_per_mm):
# Travel to the purge start
purge_str += f"G0 F{self.speed_travel} X{self.machine_right - self.border_distance} ; Move\nG0 Y{self.machine_back - 10} ; Move\n"
purge_str += f"G0 F600 Z0.3 ; Move down\n"
if self.prime_blob_enable:
purge_str += f"G1 F{self.retract_speed} E{self.retract_dist} ; Unretract\n"
purge_str += "G92 E0 ; Reset extruder\n"
# Purge two lines
purge_str += f"G1 F{self.print_speed} X{self.machine_right - self.border_distance} Y{y_stop} E{purge_volume} ; First line\n"
purge_str += f"G0 X{self.machine_right - 3 - self.border_distance} Y{y_stop} ; Move over\n"
Expand All @@ -533,6 +551,9 @@ def calculate_purge_volume(line_width, purge_length, volume_per_mm):
# Travel to the purge start
purge_str += f"G0 F{self.speed_travel} X{self.machine_left + 10} Y{self.machine_front + self.border_distance} ; Move to start\n"
purge_str += f"G0 F600 Z0.3 ; Move down\n"
if self.prime_blob_enable:
purge_str += f"G1 F{self.retract_speed} E{self.retract_dist} ; Unretract\n"
purge_str += "G92 E0 ; Reset extruder\n"
# Purge two lines
purge_str += f"G1 F{self.print_speed} X{x_stop} Y{self.machine_front + self.border_distance} E{purge_volume} ; First line\n"
purge_str += f"G0 X{x_stop} Y{self.machine_front + 3 + self.border_distance} ; Move over\n"
Expand All @@ -554,6 +575,9 @@ def calculate_purge_volume(line_width, purge_length, volume_per_mm):
purge_str += f"G0 F{self.speed_travel} Y{self.machine_back - self.border_distance} ; Ortho Move to back\n"
purge_str += f"G0 X{self.machine_right - 10} ; Ortho move to start\n"
purge_str += f"G0 F600 Z0.3 ; Move down\n"
if self.prime_blob_enable:
purge_str += f"G1 F{self.retract_speed} E{self.retract_dist} ; Unretract\n"
purge_str += "G92 E0 ; Reset extruder\n"
# Purge two lines
purge_str += f"G1 F{self.print_speed} X{x_stop} Y{self.machine_back - self.border_distance} E{purge_volume} ; First line\n"
purge_str += f"G0 X{x_stop} Y{self.machine_back - 3 - self.border_distance} ; Move over\n"
Expand All @@ -575,6 +599,9 @@ def calculate_purge_volume(line_width, purge_length, volume_per_mm):
# Travel to the purge start
purge_str += f"G0 F{self.speed_travel} X{self.machine_left + self.border_distance} Y{self.machine_front + 10} ; Move to start\n"
purge_str += f"G0 F600 Z0.3 ; Move down\n"
if self.prime_blob_enable:
purge_str += f"G1 F{self.retract_speed} E{self.retract_dist} ; Unretract\n"
purge_str += "G92 E0 ; Reset extruder\n"
# Purge two lines
purge_str += f"G1 F{self.print_speed} X{self.machine_left + self.border_distance} Y{y_stop} E{purge_volume} ; First line\n"
purge_str += f"G0 X{self.machine_left + 3 + self.border_distance} Y{y_stop} ; Move over\n"
Expand All @@ -594,6 +621,9 @@ def calculate_purge_volume(line_width, purge_length, volume_per_mm):
# Travel to the purge start
purge_str += f"G0 F{self.speed_travel} X{self.machine_right - self.border_distance} Z2 ; Move\nG0 Y{self.machine_back - 10} Z2 ; Move to start\n"
purge_str += f"G0 F600 Z0.3 ; Move down\n"
if self.prime_blob_enable:
purge_str += f"G1 F{self.retract_speed} E{self.retract_dist} ; Unretract\n"
purge_str += "G92 E0 ; Reset extruder\n"
# Purge two lines
purge_str += f"G1 F{self.print_speed} X{self.machine_right - self.border_distance} Y{y_stop} E{purge_volume} ; First line\n"
purge_str += f"G0 X{self.machine_right - 3 - self.border_distance} Y{y_stop} ; Move over\n"
Expand All @@ -613,6 +643,9 @@ def calculate_purge_volume(line_width, purge_length, volume_per_mm):
# Travel to the purge start
purge_str += f"G0 F{self.speed_travel} X{self.machine_left + 10} Z2 ; Move\nG0 Y{self.machine_front + self.border_distance} Z2 ; Move to start\n"
purge_str += f"G0 F600 Z0.3 ; Move down\n"
if self.prime_blob_enable:
purge_str += f"G1 F{self.retract_speed} E{self.retract_dist} ; Unretract\n"
purge_str += "G92 E0 ; Reset extruder\n"
# Purge two lines
purge_str += f"G1 F{self.print_speed} X{x_stop} Y{self.machine_front + self.border_distance} E{purge_volume} ; First line\n"
purge_str += f"G0 X{x_stop} Y{self.machine_front + 3 + self.border_distance} ; Move over\n"
Expand All @@ -633,6 +666,9 @@ def calculate_purge_volume(line_width, purge_length, volume_per_mm):
purge_str += f"G0 F{self.speed_travel} Y{self.machine_back - self.border_distance} Z2; Ortho Move to back\n"
purge_str += f"G0 X{self.machine_right - 10} Z2 ; Ortho Move to start\n"
purge_str += f"G0 F600 Z0.3 ; Move down\n"
if self.prime_blob_enable:
purge_str += f"G1 F{self.retract_speed} E{self.retract_dist} ; Unretract\n"
purge_str += "G92 E0 ; Reset extruder\n"
# Purge two lines
purge_str += f"G1 F{self.print_speed} X{x_stop} Y{self.machine_back - self.border_distance} E{purge_volume} ; First line\n"
purge_str += f"G0 X{x_stop} Y{self.machine_back - 3 - self.border_distance} ; Move over\n"
Expand Down Expand Up @@ -945,7 +981,7 @@ def _get_blob_code(self) -> str:
blob_string = "G0 F1200 Z20 ; Move up\n"
blob_string += f"G0 F{self.speed_travel} X{blob_x} Y{blob_y} ; Move to blob location\n"
blob_string += f"G1 F{speed_blob} E{self.prime_blob_distance} ; Blob\n"
blob_string += f"G1 F{self.retract_speed} E-{self.retract_dist} ; Retract\n"
blob_string += f"G1 F{self.retract_speed} E{self.prime_blob_distance - self.retract_dist} ; Retract\n"
blob_string += "G92 E0 ; Reset extruder\n"
blob_string += "M300 P500 S600 ; Beep\n"
blob_string += "G4 S2 ; Wait\n"
Expand Down

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