51 lines
2.2 KiB
Markdown
51 lines
2.2 KiB
Markdown
# Axis Twist Compensation
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This document describes the [axis_twist_compensation] module.
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Some printers may have a small twist in their X rail which can skew the results
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of a probe attached to the X carriage.
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This is common in printers with designs like the Prusa MK3, Sovol SV06 etc and is
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further described under [probe location
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bias](Probe_Calibrate.md#location-bias-check). It may result in
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probe operations such as [Bed Mesh](Bed_Mesh.md),
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[Screws Tilt Adjust](G-Codes.md#screws_tilt_adjust),
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[Z Tilt Adjust](G-Codes.md#z_tilt_adjust) etc returning inaccurate
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representations of the bed.
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This module uses manual measurements by the user to correct the probe's results.
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Note that if your axis is significantly twisted it is strongly recommended to
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first use mechanical means to fix it prior to applying software corrections.
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**Warning**: This module is not compatible with dockable probes yet and will
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try to probe the bed without attaching the probe if you use it.
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## Overview of compensation usage
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> **Tip:** Make sure the [probe X and Y offsets](Config_Reference.md#probe) are
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> correctly set as they greatly influence calibration.
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1. After setting up the [axis_twist_compensation] module,
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perform `AXIS_TWIST_COMPENSATION_CALIBRATE`
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* The calibration wizard will prompt you to measure the probe Z offset at a few
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points along the bed
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* The calibration defaults to 3 points but you can use the option
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`SAMPLE_COUNT=` to use a different number.
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2. [Adjust your Z offset](Probe_Calibrate.md#calibrating-probe-z-offset)
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3. Perform automatic/probe-based bed tramming operations, such as
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[Screws Tilt Adjust](G-Codes.md#screws_tilt_adjust),
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[Z Tilt Adjust](G-Codes.md#z_tilt_adjust) etc
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4. Home all axis, then perform a [Bed Mesh](Bed_Mesh.md) if required
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5. Perform a test print, followed by any
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[fine-tuning](Axis_Twist_Compensation.md#fine-tuning) as desired
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> **Tip:** Bed temperature and nozzle temperature and size do not seem to have
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> an influence to the calibration process.
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## [axis_twist_compensation] setup and commands
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Configuration options for [axis_twist_compensation] can be found in the
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[Configuration Reference](Config_Reference.md#axis_twist_compensation).
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Commands for [axis_twist_compensation] can be found in the
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[G-Codes Reference](G-Codes.md#axis_twist_compensation)
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