[bengmo]

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 problem for months, I have tried many different configurations of the drive on this axis to eliminate any slop, and I've aligned the laser countless times.

Is a 1.5 meter loop of 9mm wide timing belt(3m total length) just too much length on the belt? Do I need to get some kind of stiffer drive system? Am I just not aligning the laser to the level of perfection required? If I didn't have so much money sunk into this machine I would've gave up by now.