Hello, I’m new here, first time using a laser engraver.
I’ve noticed that often circles ar not round and not closed or text is not following the shape… I’ve seen other posts like this, I understand this happens because of x or y belt not correctly in tension. I’m not sure what I have to do. Is there someone with more experience that can help me?
Thanks in advance!
Luca
Looks to me like a belt issue
Could i have some images of your belts both Y and X please? @luca.dall
I would bet Y belts if i had to guess
Also move gantry all the way to the back and confirm its square with the frame?
Thanks for the replies. 
I’ve found out that the left part of the gantry was not square with the frame (there was a bit less than 1mm of gap between wheel and back). After spanning the left belt it’s a lot better.
I still see some waggling lines in X, I will check this evening what can be the cause of this.
Here the images of the belts after I’ve corrected the left one:
Try this too. Its quite common on LM2
Eccentric nuts
https://www.google.com/search?q=ortur+eccentric+nuts&oq=ortur+eccentric+nuts&aqs=chrome..69i57.21025j0j7&client=tablet-android-samsung-nf-rev1&sourceid=chrome-mobile&ie=UTF-8
