[EricH]

Originally Posted by Mk.32

well they are both thermoplastic polymers maybe search it a bit hehe

But if they aren't on the list, they aren't on the list. Polycarb is on the list. Delrin and acetal are not.

If you show up to inspection, and the inspectors ask what material that is, and you can't show that it's on the list, guess who'll be fixing their minibot? I know inspectors who can tell Delrin from Lexan very easily; I'd guess that acetal would also be fairly easy (I don't really have any experience with it).

Also, see PVC pipe versus PVC sheet. One is legal. One is not. Same material, different legality.