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Factor most of the magic-numbers out of PRIME_LINE #62

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Factor most of the magic-numbers out of PRIME_LINE #62

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49 changes: 39 additions & 10 deletions macros.cfg
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Original file line number Diff line number Diff line change
Expand Up @@ -148,24 +148,53 @@ description: Prints a primeline, used internally, if configured, as part of the
gcode:
SAVE_GCODE_STATE NAME=prime_line_state
{% set speed = printer["gcode_macro RatOS"].macro_travel_speed|float * 60 %}
{% set prime_x0 = params.X0|default(5)|float %}
{% set prime_y0 = params.Y0|default(5)|float %}
{% set prime_len = params.LENGTH|default(70)|float %}
{% set prime_wipe_len = params.WIPE_LENGTH|default(20)|float %}
{% set prime_axis = params.AXIS|default("Y") %}
{% if prime_axis not in "XY" %}
{% set prime_axis = "Y" %}
{% endif %}
{% if params.AXIS_INVERT %}
{% set prime_len = -prime_len %}
{% set prime_wipe_len = -prime_wipe_len %}
{% endif %}
# for some reason, the nozzle consistently goes cold if the entire line is
# ordered in a single G1, but holds true if the line is broken up into
# pieces; it's almost like the PID loop only runs between G1s
{% set prime_segments = params.SEGMENTS|default(8)|int %}
{% set filament_cross_section_area = 2.405281875 %} # approximately pi*1.75*1.75/4
{% set nozzle_diameter = params.NOZZLE_DIAMETER|default(0.4)|float %}
{% set prime_layer_height = nozzle_diameter * 5 / 8 %}
# nozzles of varying bores seem to have flats of constant wall-thickness;
# so if we used a percentage of nozzle-bore, then we'd be more likely to
# extrude past the flats, the bigger the nozzle we were being asked about.
# so it's unfortunate that SuperSlicer's width settings can't do
# what we're about to do here:
Comment on lines +170 to +174
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Given the perennial problem of link rot, I don't know how to cram a photograph like this into a comment in the code.

Thus, I'll just put here an example that clearly shows the nozzle-flats at various bores of one popular line of nozzles, the Bondtech CHT in nickel-coated brass.

image

{% set prime_line_width = nozzle_diameter + 1.6 %}
{% set prime_extrudate_area = prime_layer_height * prime_line_width %}
{% set prime_e_per_x = prime_extrudate_area/filament_cross_section_area %}
# Absolute positioning
G90
# Absolute extrusion
M82
G90
# Relative extrusion
M83
M117 Priming nozzle with prime line..
RESPOND MSG="Priming nozzle with prime line.."
# Lift 5 mm
G1 Z5 F3000
# Move to prime area
G1 X{printer.toolhead.axis_minimum.x + 5} Y{printer.toolhead.axis_minimum.y + 10} F{speed}
G1 X{printer.toolhead.axis_minimum.x + prime_x0} Y{printer.toolhead.axis_minimum.y + prime_y0} F{speed}
# Get ready to prime
G1 Z0.3 F3000
# Reset extrusion distance
G92 E0
# Prime nozzle
G1 Y{printer.toolhead.axis_minimum.y + 80} E16 F1200
G1 Z{prime_layer_height} F3000
# Relative positioning
G91
# Prime nozzle
{% for i in range(prime_segments) %}
G1 {prime_axis}{prime_len/prime_segments} E{prime_e_per_x * prime_len/prime_segments} F1200
{% endfor %}
# Wipe
G1 Y{printer.toolhead.axis_minimum.y + 100} F{speed}
G1 {prime_axis}{prime_wipe_len} F{speed}
RESTORE_GCODE_STATE NAME=prime_line_state

[gcode_macro PRIME_BLOB]
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