I have a Preenex 100w laser that’s been used very sparingly since July 2020. Doesn’t have more than a couple hours of run time, mostly cutting thin plastics and paper at no more than 50% power but usually closer to 20%.
After FINALLY properly aligning the beam, it’s now firing a ring directly from the tube. I’ve seen posts about internal mirror alignment and possible gas leak issues but those posts are 10 years old. Any current ideas about possible solutions?