It will be a few years before pure metal printing in garage is available.Hobbes, that is in no way feasible for anyone's garage. Not even close.
Even if it were, they are stoking fear in the uneducated masses for political gain. I'm right now listening to a pretty conservative and pretty pro-gun guy on the radio from the DFW area and he's even ignorant on this and he's "not comfortable" with having "untraceable" guns in the populous. He has a gun range owner on that's pointed out (correctly) that you've ALWAYS been able to build your own gun. It's perfectly legal and always has been. Just don't plan on selling, gifting it, crossing state lines or getting caught with it if you are a felon.
Again it's about politics, pure and simple.
Meanwhile
Metal 3D Printing Materials for the Home
Even if you can’t 3D print metal objects at home, you can still resort to plastic filament with added metal powders. ColorFabb, ProtoPasta or TreeD Filaments offer interesting composite metal-PLA filaments. These are filaments that contain a significant percentage of metal powders but provide enough plastic to be printed at low temperature (200 to 300 degree Celsius) with just about any 3D printer. At the same time, they contain enough metal to have the look, feel and weight of a metallic object. The iron-based filaments even form rust in certain conditions.
In composition, metal 3D printer filament is typically 50 percent metal powder. Meanwhile, Dutch 3D printer filament company Formfutura claims they have ramped up the ratio to 85 percent metal powder and 15 percent PLA. These metal 3D printer filaments are called MetalFil Ancient Bronze and MetalFil Classic Copper. You can even print them at “moderate” temperatures of 190 to 200 degree Celsius.
https://all3dp.com/1/3d-metal-3d-printer-metal-3d-printing/
Edit: If you 3d print a metal or metal infused firearm the whole "invisible gun that can't be detected" argument becomes moot doesn't it?
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