I saw it being done at a hackerspace (it's the plastic in the clear part of a two liter bottle). Basically melt it into whatever shape you want (you'll be buil

I saw it being done at a hackerspace (it's the plastic in the clear part of a two liter bottle). Basically melt it into whatever shape you want (you'll be building tooling, frames, extruders, what have you. On caveat is you need clean polypro, not used 2 liter bottles. It's not hard to get for free though, hospitals discard mountains of it.