I have a very strange issue. When printing a part with only one nozzle. After some time the UM3 automatically cleans the unused nozzle. That's okay typically this happens after layer 20 or whatever. But when I print a part with a very big initial area the cleanup process starts at the second layer.
Then the head moves back to change the nozzles and crashes/scratches the plate, in addition it gets stuck to the backward holding clips. After a lot of rattling it gets back working but already missed some steps because of the stucks and the second layer differs in position to the first layer.( 2-3 cm)
I leveled the bed manually and in auto mode etc. nothing helps. Slicer is the newest Cura also reseted the UM3. A print right after that with a smaller initial area prints just fine, because the Z axis is high enough after some layers. And the unused nozzle clean works just fine.
Any ideas on that? Seems like a bug, when the first layer is big enough so the nozzle clean procedure needs to start right after that.
Firmware is 3.7.7 ( newest at the moment)
Thanks in advance