From what I have seen of 3d printers (and this is in the $300,000 - $500,000) the material is either too weak to handle the forces of the weapon, or the tolerances are too sloppy, as in the case of sintered nylon.
I am sure there are printers out there that cost much much more money (laser set titanium for example) that could produce a receiver, but it is DAMN expensive ($1,000,000++)
There are certainly non-metal materials you could mill on a good precision CNC mill that you could build a weapon with Delrin comes to mind.
Thermoset plastics are the way of the future with these things.
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