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When I move the bed in Z it sometimes “jumps” and makes a sound. Almost like it gets stuck and then jumps to the correct position.

It doesn’t happen at the exact same position everytime, but if I run the bed from the bottom to the top it will happen 99% of the times, maybe 100%. Sometimes it happens several times in one length (from bottom to top).

What could it be and how do I fix it?

Video clip of the problem: Flashforge Dreamer problems with Z axis - YouTube

It’s har to see the actual jump, but you can hear it several times.