Great gr5 - I will do this.
I've already tightened the easily accessible pulley screws on the rails - but I didn't get to the motors as it looked hard to get to the black screws - I'll have a look tomorrow.
I should have mentioned that the LCD comes up with: endstops hit: X
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gr5 2,295
This is most likely a slipping pulley. Whichever axis moves left/right in this photo. Probably the X axis. Most likely the pulley on the motor itself. use a 2mm hex wrench and tighten the hell out of all 6 pulleys on that axis. But especially the 2 pulleys on the motor. They should be much tighter than you think is necessary. So tight that the wrench twists a little.
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