Thank you, SanderG, for your kind recommendation, I respect your opinion.   Anyway I just repaired it, my UM3 ist printing again. Wasn't so difficult, please see my photos and the description.   Both of the wires connecting the capacitive leveling sensor are plugged into contact springs on the sensor, and the other side is plugged into a print head PCB connector. Obviously there is a design problem which leads over time to breaking wires at the sensor side, due to bending the
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