docs: addition of slicer specific gcode for START_PRINT (#6063)
Signed-off-by: James Hartley <james@hartleyns.com>
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@ -10,7 +10,7 @@
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######################################################################
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# Replace the slicer's custom start and end g-code scripts with
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# START_PRINT and END_PRINT.
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# START_PRINT and END_PRINT. See docs/Slicers.md for more information on using these macros.
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[gcode_macro START_PRINT]
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gcode:
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@ -87,3 +87,37 @@ Klipper's maximum extrusion cross-section check.
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In contrast, it is okay (and often helpful) to use a slicer's
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"retract" setting, "wipe" setting, and/or "wipe on retract" setting.
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## START_PRINT macros
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When using a START_PRINT macro or similar, it is useful to sometimes
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pass through parameters from the slicer variables to the macro.
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In Cura, to pass through temperatures, the following start gcode
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would be used:
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```
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START_PRINT BED_TEMP={material_bed_temperature_layer_0} EXTRUDER_TEMP={material_print_temperature_layer_0}
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```
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In slic3r derivatives such as PrusaSlicer and SuperSlicer, the
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following would be used:
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START_PRINT EXTRUDER_TEMP=[first_layer_temperature] BED_TEMP=[first_layer_bed_temperature]
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Also note that these slicers will insert their own heating codes when
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certain conditions are not met. In Cura, the existence of the
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`{material_bed_temperature_layer_0}` and `{material_print_temperature_layer_0}`
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variables is enough to mitigate this. In slic3r derivatives,
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you would use:
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```
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M140 S0
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M104 S0
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```
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before the macro call. Also note that SuperSlicer has a
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"custom gcode only" button option, which achieves the same outcome.
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An example of a START_PRINT macro using these paramaters can
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be found in config/sample-macros.cfg
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