Except for an elastic band spring, a metal firing pin, and steel rods as detectable metal, the gun is entirely 3D-printed using ABS plastic or a durable nylon material. According to Patrick ...

This spectacular bullpup nerf gun was developed by the guys over at Mostly Harmless Arms. It is complete with 3D printed parts in a variety of colors. The Extension Spring/Latex Tubing (ESLT ...

A third length of filament acts as a spring ... before printing begins. If you still haven’t managed to boot-strap your own 3D printer don’t fret. You can always give this Nerf dart sniper ...