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Tools calibrate

An extension to calibrate tool offsets with a nozzle contact probe. Works by bumping the nozzle into the probe form multiple angles to pinpoint the nozzle location.

See Nozzle Align repo for some sensor ideas.

Configuration

See the example folder for a full example.

[tools_calibrate]
pin: ^!PF5
travel_speed: 20  # mms to travel sideways for XY probing
spread: 7  # mms to travel down from top for XY probing
lower_z: 1.0  # The speed (in mm/sec) to move tools down onto the probe
speed: 2  # The speed (in mm/sec) to retract between probes
lift_speed: 4  # Z Lift after probing done, should be greater than any Z variance between tools
final_lift_z: 6 
sample_retract_dist:2
samples_tolerance:0.05
samples:5
samples_result: median # median, average

# Settings for nozzle probe calibration - optional.
probe: probe # name of the nozzle probe to use

trigger_to_bottom_z: 0.25 # Offset from probe trigger to vertical motion bottoms out. 
# decrease if the nozzle is too high, increase if too low.

Clean your nozzles

The calibration accuracy is as good as your nozzles are clean. Clean all nozzles thoroughly before calibrating.

Calibrating tool offsets

  • First position the nozzle approximately above the probe - the probe will find the center on it's own within 1-2 mm.

  • The first tool has all offsets to 0 and is used as a baseline for other tools. Run TOOL_LOCATE_SENSOR to calibrate nozzle location for tool 0.

  • For every other tool, run TOOL_CALIBRATE_TOOL_OFFSET to measure the offset from the first tool.

All probing moves and final offsets will be printed in the console.

Calibrating nozzle bed probe.

  • Do the first two steps from above to ensure the probe is precisely under the nozzle.

  • Run TOOL_CALIBRATE_PROBE_OFFSET - to measure Z offset from nozzle triggering the probe to tool's nozzle probe activating.

All probing moves and final offsets will be printed in the console.

Troubleshooting

  • Probe triggered prior to movement, the nozzle is not touching the probe
    • Check if the probe is triggering without touching - use a multimeter to check for continuity and if it changes when pressing down on the probe. (or use TOOL_CALIBRATE_QUERY_PROBE to query the status of the probe)
    • Check if the pin is configured correctly. The example configuration is for active low with a pullup. Depending how you have wired it, you might need remove the ^! for active-high.
  • Probe triggered prior to movement, the nozzle is touching the probe, could have probed a few times already
    • Likely the initial position was too far off-center. Try to position it more accurately.
    • The probe is lowered too much and/or not enough sideways - tweak lower_z and spread