I have gotten a lg900. Now. Was new when I got it basically. Another guy imported it then sold it to me with pretty much 0 miles on it. Mine is a 100w equipped unit. And I to have noticed selecting anything less then 14% as a laser power will result in no marking ability. This could be an efficiency thing or s limitation to how much the power supply can provide on the lower side of % to fire the laser at all. Must be some sort a threshold as 14% gives results and 12% you get nothing. Seems like that could be a bad thing but might be similar to others?

Either way I've been uping the speeds for engraving and I'm up to 500mms and probably could run faster then that still at only 15% power

Guess time will tell. But seems like s really nice machine so far. And could consider buying another

B