hi all
I think the problem is after all the mirrors and lens are clean that the airassist is a must. I cut with a old 40W tube ( over 1.700 hours on it) 6mm acryl with one pass at 85% power and 4 to 5mm speed, but only with air assist not the cone version, a version like epilog from the side . without air assist it would take more then 5 runs and the cut would look ugly not usefull.
greetings
waltfl