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Yes, my fan is end of life, the firmware has been posted here: https://github.com/foosel/OctoPrint/issues/2309 , that enables one to have correct communication with octoprint serial commands, nothing else improved...

After I've done the homing test I've been pleased to early... The first print failed, the extruder stepper did not move, so I resoldered the whole E_Motor part and now it works, but today I realized a lot of layer shift in X direction, I guess my X Stepper looses steps. So I wanted to adjust the VREF's but I was not able to get any VREF Voltages... Do you have an idea where I have to pick off the vref? I tried it with my multimeter on ground to one of those GND-Pads on the board and the other on directly on the potentiometer near the drivers but I dont get any usefull reading, just floating numbers... I also touched the steppers and they where all quite cold so I guess they dont get enough power...
EDIT, or needs the motors to be running to get a vref voltage?