> Can you tell us some more about this material, what type of plastic, > density, where do you get it and what cost compared to other plastics.
www.mcmaster.com has a huge variety of supplies and so is good for comparison. You will often find items less expensive elsewhere, but their customer service is hard to beat. They have acetal (generic name) and Delrin, as well as Nylon and lubricant-filled variants of each. For comparison, 12"x12"x1/2" pieces of each: Nylon (white) $29 MDS-filled Nylon (black) $33 acetal (black) $37 Delrin (black) $39 oil-filled Nylon (green) $40 PTFE-filled Delrin (black) $183 The tensile strength of Nylon makes the swarf into basically monofilament, which makes it a real pain. -- Regards, RonB