Line and Fill mismatch

For a Ruida controller, the first thing to check is PWM Rising Edge Valid:

An incorrect setting for either axis (or both!) can produce a variety of weird symptoms, so take a look.

Take a very close look at the belts, because an old machine may have worn the teeth right off:

Check those out and let us know what you find.

We’ve found screenshots of the Machine Settings values show the configuration better than photos.