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Thanks Aciera,
That requirement eluded me when researching this subject.

John

I think you can use any spindle with an encoder. The spindle doesn't have to be exact.
The axis follows the spindle (from encoder readings) so a good/normal Z axis is what you need.

I could repeat that.
It was MaxAcceleration that had a too low value 1e6, now 1e8.
This only matters if one gets gravel sound from the motors.
Setting MaxAcceleration slightly above real max acceleration reduces that significantly.
Otherwise, there is no harm to set it very high. Set too low and it can't accelerate up to speed fast enough.
Pushed a commit, please update the eeprom. Firmware is the same.

I also added an axis_mm.ini config for metric units for testing.