the early pucks had some issues with warping, I haven't had an issue milling frames out of acetal. its not for every design. mill using the carbides, using a puma strategy ( Im using a rowland DWX 50 and the sum 3D software, major connectors have t be thicker,I use 2mm. clasp design is a beefed up akers, no I bars. Fits are great, haven't had to repair one yet or add a tooth which will be interesting when it happens. depending on height machine time varies. Good luck.