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Line_Purge.cfg
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[gcode_macro LINE_PURGE]
description: A purge macro that adapts to be near your actual printed objects
gcode:
# Get relevant printer params
{% set travel_speed = (printer.toolhead.max_velocity) * 60 | float %}
{% set cross_section = printer.configfile.settings.extruder.max_extrude_cross_section | float %}
# Use firmware retraction if it is defined
{% if printer.firmware_retraction is defined %}
{% set RETRACT = G10 | string %}
{% set UNRETRACT = G11 | string %}
{% else %}
{% set RETRACT = 'G1 E-.5 F2100' | string %}
{% set UNRETRACT = 'G1 E.5 F2100' | string %}
{% endif %}
# Get purge settings from _Kamp_Settings
{% set verbose_enable = printer["gcode_macro _KAMP_Settings"].verbose_enable | abs %}
{% set purge_height = printer["gcode_macro _KAMP_Settings"].purge_height | float %}
{% set tip_distance = printer["gcode_macro _KAMP_Settings"].tip_distance | float %}
{% set purge_margin = printer["gcode_macro _KAMP_Settings"].purge_margin | float %}
{% set purge_amount = printer["gcode_macro _KAMP_Settings"].purge_amount | float %}
{% set flow_rate = printer["gcode_macro _KAMP_Settings"].flow_rate | float %}
# Calculate purge origins and centers from objects
{% set all_points = printer.exclude_object.objects | map(attribute='polygon') | sum(start=[]) %} # Get all object points
{% set purge_x_min = (all_points | map(attribute=0) | min | default(0)) %} # Object x min
{% set purge_x_max = (all_points | map(attribute=0) | max | default(0)) %} # Object x max
{% set purge_y_min = (all_points | map(attribute=1) | min | default(0)) %} # Object y min
{% set purge_y_max = (all_points | map(attribute=1) | max | default(0)) %} # Object y max
{% set purge_x_center = ([((purge_x_max + purge_x_min) / 2) - (purge_amount / 2), 0] | max) %} # Create center point of purge line relative to print on X axis
{% set purge_y_center = ([((purge_y_max + purge_y_min) / 2) - (purge_amount / 2), 0] | max) %} # Create center point of purge line relative to print on Y axis
{% set purge_x_origin = ([purge_x_min - purge_margin, 0] | max) %} # Add margin to x min, compare to 0, and choose the larger
{% set purge_y_origin = ([purge_y_min - purge_margin, 0] | max) %} # Add margin to y min, compare to 0, and choose the larger
# Calculate purge speed
{% set purge_move_speed = (flow_rate / 5.0) * 60 | float %}
{% if cross_section < 5 %}
{action_respond_info("[Extruder] max_extrude_cross_section is insufficient for purge, please set it to 5 or greater. Purge skipped.")}
{% else %}
{% if verbose_enable == True %}
{action_respond_info("Moving filament tip {}mms".format(
(tip_distance),
)) }
{% endif %}
{% if printer.firmware_retraction is defined %}
{action_respond_info("KAMP purge is using firmware retraction.")}
{% else %}
{action_respond_info("KAMP purge is not using firmware retraction, it is recommended to configure it.")}
{% endif %}
{% if purge_y_origin > 0 %}
{action_respond_info("KAMP purge starting at {}, {} and purging {}mm of filament, requested flow rate is {}mm3/s.".format(
(purge_x_center),
(purge_y_origin),
(purge_amount),
(flow_rate),
)) }
{% else %}
{action_respond_info("KAMP purge starting at {}, {} and purging {}mm of filament, requested flow rate is {}mm3/s.".format(
(purge_x_origin),
(purge_y_center),
(purge_amount),
(flow_rate),
)) }
{% endif %}
SAVE_GCODE_STATE NAME=Prepurge_State # Create gcode state
{% if purge_y_origin > 0 %} # If there's room on Y, purge along X axis in front of print area
G92 E0 # Reset extruder
G0 F{travel_speed} # Set travel speed
G90 # Absolute positioning
G0 X{purge_x_center} Y{purge_y_origin} # Move to purge position
G0 Z{purge_height} # Move to purge Z height
M83 # Relative extrusion mode
G1 E{tip_distance} F{purge_move_speed} # Move filament tip
G1 X{purge_x_center + purge_amount} E{purge_amount} F{purge_move_speed} # Purge line
{RETRACT} # Retract
G0 X{purge_x_center + purge_amount + 10} F{travel_speed} # Rapid move to break string
G92 E0 # Reset extruder distance
M82 # Absolute extrusion mode
G0 Z{purge_height * 2} F{travel_speed} # Z hop
{% else %} # If there's room on X, purge along Y axis to the left of print area
G92 E0 # Reset extruder
G0 F{travel_speed} # Set travel speed
G90 # Absolute positioning
G0 X{purge_x_origin} Y{purge_y_center} # Move to purge position
G0 Z{purge_height} # Move to purge Z height
M83 # Relative extrusion mode
G1 E{tip_distance} F{purge_move_speed} # Move filament tip
G1 Y{purge_y_center + purge_amount} E{purge_amount} F{purge_move_speed} # Purge line
{RETRACT} # Retract
G0 Y{purge_y_center + purge_amount + 10} F{travel_speed} # Rapid move to break string
G92 E0 # Reset extruder distance
M82 # Absolute extrusion mode
G0 Z{purge_height * 2} F{travel_speed} # Z hop
{% endif %}
RESTORE_GCODE_STATE NAME=Prepurge_State # Restore gcode state
{% endif %}