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Hey, 

I am encountering the Z-axis homing error. 

Before the Error is thrown the Z-stage is rattling. It seems like the stepper is recieving steps with about 150 Hz, but not strongly enough to move the stage. If I help it along gently the homing sequence is completed successfully. 

After that workaround the Machine operates normally. 

The indicator light of the optical endstop triggers correcly. So does the web interface.

If you have got any idea what may be going on, help is greatly appreciated