Of possible interest to CoreXY printer builders is that the latest release of RepRapFirmware supports bed levelling using 2, 3 or (if you insist) 4 Z leadscrew motors driven from individual stepper drivers. The procedure is described at [duet3d.com]. It uses a least-squares algorithm similar to our famous delta printer auto calibration algorithm.
When multiple motors are used to drive the Z axis it is not uncommon for them to lose sync when the printer is powered off and on again. This feature provides automatic resynchronization.
We had expected to be the first firmware to support bed levelling using multiple leadscrews, but Repetier beat us to it.
When multiple motors are used to drive the Z axis it is not uncommon for them to lose sync when the printer is powered off and on again. This feature provides automatic resynchronization.
We had expected to be the first firmware to support bed levelling using multiple leadscrews, but Repetier beat us to it.