Z probe Offset Calculation. possibility

[lukas.aurarum]

I run a BLtouch.

I would like to automatically re-calibrate the Z-offset of the BL Touch.

Can i first Z home the bed first by using the motor stall function on Z axis,
then re-home Z axis using the BL touch.
The resulting difference should be the exact Z offset for the BL touch.
This should all be able to be done in a Macro i believe.

This would involve setting z endstop to motor stall, the on second pass setting endstop to bltouch.

[dc42]

You could do it the other way round. Home Z using bltouch, then use a G1 S3 Z move with the type of Z endstop set to stall detection. That will adjust the tool Z offset.

Stall detection is at best accurate to +/- 1 full step of the motor.