OK folks, Referring to the photo, I did my first plexiglass routing yesterday. I made some foundry pattern letters .06" deep on .125" thick acryllic plexiglass. the routing seemed to work but I noticed I got a buildup of melted plastic on my router bit. I suspect I'm running the rpm too fast. I had the router set at 3 1/2 out of 5. I also used a spiral bit that I'm unsure what it's designed to cut. this bit came with the Openbuilds CNC machine I bought. What I really am trying to do is route letters with a slight pattern draft angle: about 2 or 3 degrees. Interestingly enough, although the bit I used had no angle in it, it did pull from the sand in a test mold I made last night. But this is pure luck. Ideally I need a bit with a little angle to it. So here's my questions: 1. what speeds are recommended for acryllic? 2. Can anyone recommend a good tapered bit with just a couple of degrees to it for what I'm doing.