Hello Barry, hello Jon,
It works again. It had nothing to do with contamination, old filament residue or similar. The axles were clear, no hidden debris, the bearings were where they should be and the plate was clean and correctly positioned.
The heating bed didn’t even come close to the nozzle, but only up to half of the axles and then started to want to level.
Even repeated restarts did not help. I then read somewhere in the forum that this had also happened to others and one said to move the Z-axis when cold.
I tried that yesterday. Without calling up the homing function on the printer display, I then moved the Z-axis upwards step by step via the menu past the point in question until just below the nozzle (which was of course clean).
I then started a print and everything ran normally again.
What could have been the cause?
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