It seems you are loosing steps on x. There are several possible causes for this.
Did you exchange drivers, modified the bearings or changed the drivers current, did you change acceleration/jerk?
Possible solutions
- try to adjust the motor current, google your driver and you will find more information on how exactly to do that. If the motor is getting to hot to touch the current might be set to high, if it remains very cold it might be to low.
- lower acceleration and jerk settings
- make sure the bearings run smooth
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