@zinfamous - most consumer grade printers seem to use different types of plastic. But ones that print in metal vary wildly in price. You can get some that print in stainless for
between 1500 and 10k see link.
But I have no idea what kind of tolerances, toughness and durability you can expect from what you print.
I guess if you're doing a complete ground up build, you might be able to save some money on less performance critical parts but I'm not sure I'd take any of the makers at their word. I mean if you're trying to fly to work and you see metal debris flying off your helo. who ya gonna call as you rapidly lose altitude.