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Dean448, that's very interesting, I wonder what the problem could be then. I remember seeing a post about a stepper setting that can cause you to lose a step when you change direction but I didn't...

I'm using a ruida controller with lightburn and rdworks, tried them both, they both have the same problem

Ok i tried doubling the steps per rev from 6400 to 12800. sadly it doesn't help. i'm beginning to convince myself the belt is no good. checked the tension again, it's good

I have checked the belts and pulleys a million times and played with levels of tightness from rubber band to guitar string. I will check the step resolution and try turning it up

I built the Further Fabrication laser and I can't seem to get rid of the backlash on the longer axis. It makes my circles look like crap, check out the attached photo. I have been chasing this...

I just posted a video about this on YouTube, it's not edited or detailed but it gives an idea of how I did this cheap+easy.

https://www.youtube.com/watch?v=XGl9BwqvdhA