Thank you very much for the good advice. It has now been running for a few days and printed a lot without my problem having occurred at any point. I ended up replacing the stepper motor and cables. I also set up amps and set Idle Current Percentage up from 30 to 60. I have not experimented with the right solution but am just happy that it works as it should, I think that Idle Current Percentage was too low in relation to the weight from the bed it was supposed to hold when it went down in tension. Thanks again for sparring.
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RE: Problems with the z axis