Late last year it was announced that design files for firearm related objects would no longer be allowed on Thingverse. This decision came after 3D printer designs for AR-15 lowers were posted. In response Defense Distributed has launched DEFCAD, a site to host 3D printer designs for firearm related items. As of this writing designs for a shotshell holder, an AR-15 pistol grip, an AR-15 lower, and many other items are available.
The best thing about the Internet is the fact that no information posted to it can ever be completely killed. Despite Thingverse’s attempt to censor firearm related 3D printer designs they are still available.