3D printing can be a fun and productive hobby and skill, but there can be a lot of confusion around the files involved. Here are some you should know about.

The gun appears to be a Chairmanwon V1, a tweak of a popular partially 3D-printed Glock-style design known as the FMDA 19.2—an acronym that stands for the libertarian slogan “Free Men Don’t ...

"Glock switches," small devices capable of turning almost any handgun into a machine gun, are increasingly being found among seized firearms in the Phoenix area, according to the Bureau of Alcohol ...

Part of the gun that the police believe was used to kill the C.E.O. of UnitedHealthcare was made by a 3D printer using a popular design found online.