Circles burning like ovals

I have not touched my settings in many months and out of nowhere my laser engraves circle as ovals? Belts seem to be fine any clues as to why this is happening?

Even without any images, I would bet one or more of the set (grub) screws has loosened. Check them ALL. If you find one easy to loosen, you are in the ballpark. Make sure you tighten them on the flat portion of the shaft.

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