95 lines
2.0 KiB
Markdown
95 lines
2.0 KiB
Markdown
---
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tag: m0851
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title: XYZ Probe Offset
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brief: Set the Z probe XYZ offset from nozzle
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author: thinkyhead
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requires: HAS_BED_PROBE
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group: none
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codes: [ M851 ]
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notes:
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- The default (factory) values are set by
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- |
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- (version 1.x)
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- `X_PROBE_OFFSET_FROM_EXTRUDER`
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- `Y_PROBE_OFFSET_FROM_EXTRUDER`
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- `Z_PROBE_OFFSET_FROM_EXTRUDER`
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- (version 2.x)
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- `NOZZLE_TO_PROBE_OFFSET`
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and are integer values.
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Positions:
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X offset: -left +right [of the nozzle]
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Y offset: -front +behind [the nozzle]
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Z offset: -below +above [the nozzle]
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```
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+-- BACK ---+
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| |
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L | (+) P | R <-- probe (20,20)
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E | | I
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F | (-) N (+) | G <-- nozzle (10,10)
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T | | H
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| (-) | T
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O-- FRONT --+
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(0,0)
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```
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parameters:
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-
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tag: X
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optional: true
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description: Z probe X offset
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values:
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-
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unit: linear
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type: float
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-
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tag: Y
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optional: true
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description: Z probe Y offset
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values:
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-
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unit: linear
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type: float
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-
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tag: Z
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optional: true
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description: Z probe Z offset
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values:
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-
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unit: linear
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type: float
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examples:
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-
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pre: Set a reasonable offset for an inductive probe
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code: M851 Z-2.0
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-
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pre: A probe that is triggered by the nozzle itself
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code: M851 Z1.2
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-
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pre: Set the XY distance (probe left front of nozzle)
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code: M851 X-1.70 Y-1.30
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-
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pre: Set the XY distance (probe right back of nozzle)
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code: M851 X0.20 Y.40
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---
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Set the XYZ distance from the nozzle to the probe trigger-point.
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The easiest way to get the Z offset value is to:
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- Home the Z axis.
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- Raise Z and deploy the probe.
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- Move Z down slowly until the probe triggers.
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- Take the current Z value and negate it. (`5.2` => `-5.2`)
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- Set with `M851 Z-5.2` and `#define Z_PROBE_OFFSET_FROM_EXTRUDER -5.2`.
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For X and Y you have to measure the distance.
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