[s1artibartfast]

I was mostly just curious about the person who said they absolutely cant work with plastic, but can work with metal.

I like some things that are repairable, but don't think everything needs to be. My product choices rarely are willing to compromise cost, function, or aesthetics for repairability.

[ElevenLathe]

That's the idea (I assume, not the same guy): you're right that is mostly the form of the part that makes it easy/hard to work, not the material, but nobody designs machinable plastic parts. they design injection-moldable ones. So in practice "plastic part" is synonymous with "impossible to recreate in small quantities". Yes, in theory plastic parts can be of the same shape (and therefore ease of boutique manufacturing) as metal ones, but they aren't, not in the real world.