67 lines
2.6 KiB
Markdown
67 lines
2.6 KiB
Markdown
This document describes the method for calibrating the x, y, and z
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offsets of an "automatic z probe" in Klipper. This is useful for users
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that have a `[probe]` or `[bltouch]` section in their config file.
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# Calibrating probe X and Y offsets
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To calibrate the X and Y offset, navigate to the OctoPrint "Control"
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tab, home the printer, and then use the OctoPrint jogging buttons to
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move the head to a position near the center of the bed.
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Place a piece of blue painters tape (or similar) on the bed underneath
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the probe. Navigate to the OctoPrint "Terminal" tab and issue a PROBE
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command:
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```
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PROBE
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```
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Place a mark on the tape directly under where the probe is (or use a
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similar method to note the location on the bed).
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Issue a `GET_POSITION` command and record the toolhead XY location
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reported by that command. For example if one sees:
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```
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Recv: // toolhead: X:46.500000 Y:27.000000 Z:15.000000 E:0.000000
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```
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then one would record a probe X position of 46.5 and probe Y position
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of 27.
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After recording the probe position, issue a series of G1 commands
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until the nozzle is directly above the mark on the bed. For example,
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one might issue:
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```
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G1 F300 X57 Y30 Z15
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```
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to move the nozzle to an X position of 57 and Y of 30. Once one finds
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the position directly above the mark, use the `GET_POSITION` command
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to report that position. This is the nozzle position.
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The x_offset is then the `nozzle_x_position - probe_x_position` and
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y_offset is similarly the `nozzle_y_position - probe_y_position`.
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Update the printer.cfg file with the given values, remove the
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tape/marks from the bed, and then issue a `RESTART` command so that
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the new values take effect.
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# Calibrating probe Z offset
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Providing an accurate probe Z offset is critical to obtaining high
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quality prints.
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Start by homing the printer and then move the head to a position near
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the center of the bed. Navigate to the OctoPrint terminal tab and run
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the `PROBE_CALIBRATE` command to start Klipper's probe calibration
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tool.
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This tool will perform an automatic probe, then lift the head, move
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the nozzle over the location of the probe point, and start the manual
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probe tool. Once the manual probe tool starts, perform the
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["paper test"](Bed_Level.md#the-paper-test) to determine the actual
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nozzle height at the given point.
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If the nozzle does not move to a position above the probe point, then
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`ABORT` the manual probe tool and perform the XY probe offset
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calibration described above.
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After completing the "paper test", use the `ACCEPT` command to
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accept the current Z height and then use the `SAVE_CONFIG` command to
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save the given probe z_offset to the config file.
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