I have a 130-150 W Sinjoe Laser. It will not cut through 1/4 " cardboard at 60% power (not even after a second pass) and it will not cut through 1/4" wood, period. Not sure it would get through 1/8" wood actually.
It is about 3 years old but does not really have that much use. Maybe a dozen hours a month on average?
The lenses and mirrors seem clean and in decent shape and I am running it up to 30 mA. It used to cut OK, not amazing, but way better than this. The change does not seem particularly gradual. The water cooler has always worked and is tied into the on switch so I can't forget it.
Any ideas, necessary information I am leaving out or recommendations? I searched the forum for a bit but didn't get to anything similar (thought there must be lots of this)