I'm trying to cut acrylic for the first time and the laser is really good at it. I read to leave the paper on, but my concern is a lot of flames shoot out when I do that. The flames are going up into the lense as well as the auto Z axis measuring device. Is it safe to assume all of those things are made to withstand the heat from these flames? I've tried cutting both with the compressor on and with it off and the flames appear to be about the same. The exhaust fan appears to mostly keep them flat to the work piece and aiming toward the back of the machine, but I can see them at times up around the lense and sensor.