We should also clarify here for those who might not be in the know: while it is possible to 3D print metal parts, it's a lot harder, requiring lots of expertise

We should also clarify here for those who might not be in the know: while it is possible to 3D print metal parts, it's a lot harder, requiring lots of expertise, and it's more expensive than 3D printing plastic parts. I think every reference to 3D printing in this discussion is to 3D printing plastic parts.