I bought a Pinnacle M-25 laser engraver October 2005. We use it pretty much every day for maybe an hour. We mainly engrave nameplates, glass and wood.
A few months ago we started to notice that it would take more power to produce the same results we got previously. Now we notice that some items we engrave have a striped effect.
I have done a good job cleaning the lenses/mirror and rail. I am not sure if I am missing something, or if it is time to replace the tube. if so, I don't even know where to get such a thing replaced. Any help is appreciated.