From d02073b8a7cfbecb5d75caff1b1a5f7cb78a7e82 Mon Sep 17 00:00:00 2001 From: Cambridge Yang Date: Sun, 4 Jun 2023 04:42:26 -0400 Subject: [PATCH] add my implementation of cut macro --- ercf_additional.cfg | 147 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 147 insertions(+) create mode 100644 ercf_additional.cfg diff --git a/ercf_additional.cfg b/ercf_additional.cfg new file mode 100644 index 0000000..713f888 --- /dev/null +++ b/ercf_additional.cfg @@ -0,0 +1,147 @@ +[gcode_macro CUT_FILAMENT] +description: Cut filament by pressing the cutter on a fixed pin with a horizontal movement. + +# Distance to retract prior to making the cut, this reduces wasted filament but might cause clog +# if set too large and/or if there are gaps in the hotend assembly +# This must be less than the distance from the nozzle to the cutter. +variable_retract_length: 35 + +# The location of the pin, this should be the position of the toolhead when the cutter +# just lightly touches the pin +variable_pin_loc_x: 20 +variable_pin_loc_y: 21.0 + +# The starting and end positions when making the cut +# In particular, instead of making the cut by traveling to the pin location above, +# we leave a small safety margin along X-axis to avoid scratching on the pin when traveling +# This should also give a small distance to produce some momentum when pressing on the pin +variable_pin_park_x_dist: 5 + +# Position of the toolhead when the cutter is fully compressed +# Should leave a small headroom to avoid banging the toolhead or gantry +variable_pin_loc_x_compressed: 5 + +# Speed related settings +# Note that if the cut speed is too fast, the steppers can lose steps +# Therefore, for a cut: +# - We first make a fast move to accumulate some momentum and get the cut blade to the initial contact with the filament +# - We then make a slow move for the actual cut to happen +variable_travel_spd: 7800 +variable_cut_fast_move_spd: 2000 +variable_cut_slow_move_spd: 500 +variable_evacuate_speed: 7800 +variable_cut_dwell_time: 200 ; time to dwell at the cut point in ms +variable_cut_fast_move_fraction: 0.5 ; fraction of the move that uses fast move + +# Safety margin for fast vs slow travel +# When traveling to the pin location, we make a safer but longer move if we closer to the pin than this specified margin +# Usually setting these to the size of the toolhead (plus a small margin) should be good enough +variable_safe_margin_x: 30 +variable_safe_margin_y: 30 + +# Number of repeats for the cut +# Better be one to avoid small debris due to different cutting positions for different tries +variable_num_cut_repeats: 1 + +# Whether to eject the filament at the end +variable_final_eject: 0 + +# Currently ERCF software assumes that tip forming move always moves the extruder (and consequently the encoder) +# Ideally, we should bring formal support of filament cutters to the ERCF software +# In the short term, we perform a "hack" where we wiggle the extruder a little after cutting, +# if the extruder did not make enough movement during the filament cutting phase. +variable_extruder_minimum_movement: 0 ; the minimum extruder movement required for this tip forming move, this depends on the minimum distance that the encoder can reliably detect + ; setting it to a lower value requires the ERCF encoder to be more sensitive. +variable_extruder_wiggle_length: 10 ; the length to retract -> extrude during a wiggle, this needs to be large enough for the encoder to detect the movement +variable_extruder_wiggle_repeat: 3 ; number of repeats for the wiggle + +# State variables +variable_retracted_length_: 0 ; a state variable to keep track of how much we have retracted during the last cut, this is useful for restoring the filament position + +gcode: + {% set RETRACT_LENGTH = params.RETRACT_LENGTH | default(printer['gcode_macro CUT_FILAMENT']['retract_length']) | float %} + {% set FINAL_EJECT = params.FINAL_EJECT | default(printer['gcode_macro CUT_FILAMENT']['final_eject'], True) | int %} + {% set NUM_CUT_REPEATS = params.NUM_CUT_REPEATS | default(printer['gcode_macro CUT_FILAMENT']['num_cut_repeats']) | int%} + {% set current_loc_x = printer.gcode_move.gcode_position.x %} + {% set current_loc_y = printer.gcode_move.gcode_position.y %} + + SAVE_GCODE_STATE NAME=cut_filament_state + + {% if ("x" not in printer.toolhead.homed_axes) or ("y" not in printer.toolhead.homed_axes) %} + G28 X Y + {% endif %} + + {% set prev_pa = printer.extruder.pressure_advance %} + SET_PRESSURE_ADVANCE ADVANCE=0 ; temporaily disable PA + + {% set pin_park_x_loc = pin_loc_x + pin_park_x_dist %} + {% set pin_park_y_loc = pin_loc_y %} + {% set _extruder_moved_dist = 0 %} + + M83 ; relative extrusion + {% if RETRACT_LENGTH > 0 %} + G1 E-{RETRACT_LENGTH} F3000 ; retract to save filament waste + {% set _extruder_moved_dist = _extruder_moved_dist + RETRACT_LENGTH %} + {% endif %} + SET_GCODE_VARIABLE macro=CUT_FILAMENT variable=retracted_length_ value={RETRACT_LENGTH} + + G90 ; absolute positioning + _MOVE_TO_CUTTER_PIN PIN_PARK_X_LOC={pin_park_x_loc} PIN_PARK_Y_LOC={pin_park_y_loc} + + {% set fast_slow_transition_loc = (pin_loc_x_compressed - pin_park_x_loc) * cut_fast_move_fraction + pin_park_x_loc | float %} + {% for _ in range(NUM_CUT_REPEATS) %} + G1 X{fast_slow_transition_loc} F{cut_fast_move_spd} ; make a fast move to initiate contact of the blade with the filament + G1 X{pin_loc_x_compressed} F{cut_slow_move_spd} ; do the cut in slow move + G4 P{cut_dwell_time} + G1 X{pin_park_x_loc} F{evacuate_speed} ; evacuate + {% endfor %} + + {% if FINAL_EJECT == 1 %} + G1 E-80 F3000 + {% set _extruder_moved_dist = _extruder_moved_dist + 80 %} + {% endif %} + + {% if _extruder_moved_dist < extruder_minimum_movement %} + # make some wiggle moves so that the encoder catch them + {% for _ in range(extruder_wiggle_repeat) %} + G1 E-{extruder_wiggle_length} F3000 + G1 E{extruder_wiggle_length} F3000 + {% endfor %} + {% endif %} + + SET_PRESSURE_ADVANCE ADVANCE={prev_pa} ; restore PA + RESTORE_GCODE_STATE NAME=cut_filament_state + +[gcode_macro _MOVE_TO_CUTTER_PIN] +description: helper to move the toolhead to the target pin in either safe or faster way, depending on toolhead clearance. +gcode: + {% set safe_margin_x = printer['gcode_macro CUT_FILAMENT']['safe_margin_x'] | float %} + {% set safe_margin_y = printer['gcode_macro CUT_FILAMENT']['safe_margin_y'] | float %} + {% set travel_spd = printer['gcode_macro CUT_FILAMENT']['travel_spd'] | float %} + {% set pin_park_x_loc = params.PIN_PARK_X_LOC | float %} + {% set pin_park_y_loc = params.PIN_PARK_Y_LOC | float %} + + G90 ; absolute positioning + {% if ((printer.gcode_move.gcode_position.x - pin_park_x_loc) | abs < safe_margin_x) or ((printer.gcode_move.gcode_position.y - pin_park_y_loc | float) | abs < safe_margin_y) %} + # Make a safe but slower travel move + G1 X{pin_park_x_loc} F{travel_spd} + G1 Y{pin_park_y_loc} F{travel_spd} + {% else %} + G1 X{pin_park_x_loc} Y{pin_park_y_loc} F{travel_spd} + {% endif %} + +[gcode_macro restore_cutted_filament] +description: extrudes an amount equal (or proportional) to the retraction during the last cut +gcode: + SAVE_GCODE_STATE NAME=restore_cutted_filament_state + {% set RETRACTED_LENGTH = printer['gcode_macro CUT_FILAMENT']['retracted_length_'] | float %} + M83 ; relative extrusion + G1 E{RETRACT_LENGTH} F3000 + SET_GCODE_VARIABLE macro=CUT_FILAMENT variable=retracted_length_ value=0 ; clear the retracted amount + RESTORE_GCODE_STATE NAME=restore_cutted_filament_state + + +[gcode_macro _ERCF_FORM_TIP_STANDALONE] +gcode: + CUT_FILAMENT {rawparams} +