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3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
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The Liberator is a completely 3D printed single-shot pistol that can shoot 9mm.
The Washbearis a completely 3D printed revolver.
3D printed ammo is currently in development.
They aren't very practical, but can likely go through metal detectors.
Except for the firing pins. And the ammo. So it's likely that they actually can't, unless the detectors at the facility in question are so detuned that they'd also allow through razors and small pocketknives.
Printed bullets would be like firing frozen paintballs at people. Injurious, yes. Deadly, most likely not.