[Proper Printing] didn’t just think it, he’s made a working hot glue 3D printer. As you’d expect, it’s the extruder which forms the hack here. A Dremel hot glue gun supplies the hot end ...

Let the hot glue cool and harden ... and using the PLA glue gun to quickly and efficiently stick those 3D-printed pieces together with no need for clamping was better than expected.

Ars Technica has covered these issues for years, since both "ghost guns" and machine gun converters can be produced using 3D-printed parts, the schematics for which are now widely available online.

A 20-year-old Georgia technical college student has pleaded guilty to using a 3D printer to manufacture a machine gun. Federal agents seized 3D printers, multiple firearms, and silencers from the ...