I’ve had my Chinese 40w a couple weeks now. I seem to have all the alignment, air assist and replacement table working… This was yesterdays .jpg engraving test after pulling out the old air duct and table with the spring clamp thing. 1/4 birch about 6" (135mm) round, 140mm speed at about 3 power. I’m pretty happy with the precision and detail these things can obtain. Eventually I’ll do a Lightobject X7 DSP upgrade, but for now it does work!