I got a successful cuts done today in HDPE. Parts for my dust boot. The 34 mm/sec with a 1/4" flat cutter at 3.17 mm step was way too fast. Router speed makita at 3. Had a perfect cut at 12 mm/sec, 3.17 step and router at 4 makita with 1/4 " flat carbide3d cutter. 1/2" hdpe in 4 passes. The side shields and pulley covers worked fine also. Put the boot together tomorrow and no more mess, I hope. Oh yeah, the cutter stayed cool to touch for every cut, not touching it running but when changing tools during the run. Good shaving a little thinner than rice about the size of short grain rice