I reported some issue on my NEJE Master 2 (20W), when I tried to print somewhere in paper, the shapes are not finnished, it looks like that laser power goes down before finnish the engraving,
This issue is common to diff. speed settings (Tested: 10/15/20mm/s / 60/70/80%)
Do You know what can be solved this issue ? Some settings in lightburn ?
You have focus, mechanical and electronic issues, by the looks.
Start with the mechanical - get it running smoothly and reliably. all mounts and screws firm. then check all your electronic connections. You can put a dab of hot glue or silicon on the connectors to firm them up.
Then, when it’s moving smoothly and reliably, get the focus right.