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126 lines
4.9 KiB
Markdown
126 lines
4.9 KiB
Markdown
# Slicers
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This document provides some tips for configuring a "slicer"
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application for use with Klipper. Common slicers used with Klipper are
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Slic3r, Cura, Simplify3D, etc.
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## Set the G-Code flavor to Marlin
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Many slicers have an option to configure the "G-Code flavor". The
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default is frequently "Marlin" and that works well with Klipper. The
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"Smoothieware" setting also works well with Klipper.
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## Klipper gcode_macro
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Slicers will often allow one to configure "Start G-Code" and "End
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G-Code" sequences. It is often convenient to define custom macros in
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the Klipper config file instead - such as: `[gcode_macro START_PRINT]`
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and `[gcode_macro END_PRINT]`. Then one can just run START_PRINT and
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END_PRINT in the slicer's configuration. Defining these actions in the
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Klipper configuration may make it easier to tweak the printer's start
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and end steps as changes do not require re-slicing.
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See [sample-macros.cfg](../config/sample-macros.cfg) for example
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START_PRINT and END_PRINT macros.
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See the [config reference](Config_Reference.md#gcode_macro) for
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details on defining a gcode_macro.
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## Large retraction settings may require tuning Klipper
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The maximum speed and acceleration of retraction moves are controlled
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in Klipper by the `max_extrude_only_velocity` and
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`max_extrude_only_accel` config settings. These settings have a
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default value that should work well on many printers. However, if one
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has configured a large retraction in the slicer (eg, 5mm or greater)
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then one may find they limit the desired speed of retractions.
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If using a large retraction, consider tuning Klipper's
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[pressure advance](Pressure_Advance.md) instead. Otherwise, if one
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finds the toolhead seems to "pause" during retraction and priming,
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then consider explicitly defining `max_extrude_only_velocity` and
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`max_extrude_only_accel` in the Klipper config file.
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## Do not enable "coasting"
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The "coasting" feature is likely to result in poor quality prints with
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Klipper. Consider using Klipper's
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[pressure advance](Pressure_Advance.md) instead.
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Specifically, if the slicer dramatically changes the extrusion rate
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between moves then Klipper will perform deceleration and acceleration
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between moves. This is likely to make blobbing worse, not better.
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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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## Do not use "extra restart distance" on Simplify3d
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This setting can cause dramatic changes to extrusion rates which can
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trigger Klipper's maximum extrusion cross-section check. Consider
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using Klipper's [pressure advance](Pressure_Advance.md) or the regular
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Simplify3d retract setting instead.
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## Disable "PreloadVE" on KISSlicer
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If using KISSlicer slicing software then set "PreloadVE" to
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zero. Consider using Klipper's [pressure advance](Pressure_Advance.md)
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instead.
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## Disable any "advanced extruder pressure" settings
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Some slicers advertise an "advanced extruder pressure" capability. It
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is recommended to keep these options disabled when using Klipper as
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they are likely to result in poor quality prints. Consider using
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Klipper's [pressure advance](Pressure_Advance.md) instead.
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Specifically, these slicer settings can instruct the firmware to make
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wild changes to the extrusion rate in the hope that the firmware will
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approximate those requests and the printer will roughly obtain a
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desirable extruder pressure. Klipper, however, utilizes precise
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kinematic calculations and timing. When Klipper is commanded to make
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significant changes to the extrusion rate it will plan out the
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corresponding changes to velocity, acceleration, and extruder
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movement - which is not the slicer's intent. The slicer may even
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command excessive extrusion rates to the point that it triggers
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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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```
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START_PRINT EXTRUDER_TEMP=[first_layer_temperature] BED_TEMP=[first_layer_bed_temperature]
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```
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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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