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