I have some acrylic and I have no idea if it was cast or extruded.
I want to machine it on my CNC router. I've seen reports of extruded acrylic being problematic for some sorts of work.
Can I machine extruded acrylic with a router okay?
Is there a way to tell one from the other? Someone told me extruded usually has a plastic film covering, and that cast typically comes protected with paper. Is that a good indicator?