this, plus you can buy a an actual mill and convert it to CNC for about 2K with some stepper motors, LinuxCNC and controller boards. You can pump out aluminum AR lowers all day erry day. (not that I would ever advocate this as it is totally illegal, of course)
nozzles are extremely unreliable. the market has gotten all fucked up since RepRap fucked everything and everyone. There will never be a fully-polymer printed firearm that can handle high pressure rounds for than a couple firings. CNC mills are just as cheap if not cheaper, already.
3D printing is useful for visualizing prototypes, rapidly. That's about the end of them.
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