From Ammoland:

If companies get into 3D printing, you can be sure they will do everything in their power to shut down sites that violate their patents on their IP. It will destroy the 3D printing community. Corporations would usurp the small tight knit group of designs like CTRL Pew and Ivan The Troll.

Another drawback of DRM is that a lot of it is going to an “online-only” model. This model is standard with video games. The game reaches out to a remote server to validate the copy of the software. If a gamer wants to play a single-player game offline, they can’t. The game requires an internet connection to run.

With gun files, this means every time to print something a server knows, and it isn’t too much of a jump to assume the government knows as well. This situation would defeat the whole purpose of 3D printing gun files. Using 3D printers to print gun files is to defeat gun control and not feed into it.