Do you get clean burns in other scenarios? In other words, is this a tried and true laser that’s having issues with this one job or is this being exercised for the first time?
This IS the first runs for this laser. I’ve successfully done this burn using my old (home) Ortur LM2, to the point I convinced my work to buy the LM2 Pro (the one acting this way).
Agree with @killrob that you need to check belt tension and pulleys.
However, I can’t really make sense of what’s going on based the file. It looks like you’ve got 2 full burns offset on the Y-axis. If this was just normal belt skipping I would expect there to be gaps in the burn or other artifacts. I wouldn’t expect to see a what looks like a full double burn.
Can you confirm that the file that you attached is the exact setup that you had at the time of the burn?
I recently started getting this issue on one of our machines at work. Only software fix I could figure out was to disable Bi-Directional Fill. Was thinking pulley issue myself, but everything seems to be in order.a