If the pulleys on the X and Y axis come loose, you may need to tighten down the set screws to hold these in place.
Move the Extruder into the center of the printer, and find the set screws on the pulleys in the corners of the axis. There are a total of 10 pulleys that you must check (2-3 in each corner), and each has 2 set screws to make sure to tighten down.
It would be great to include a picture of the problem. Finding a resolution has a lot to do with figure it out. Pictures are worth a thousand words or at least dozen of searches.
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