DEFCAD was the largest, but not the only, repository. Knowledgeable users also sourced files from:
DEFCAD, Inc., is an American technology company and a subsidiary of Defense Distributed. At its core, it is a search engine and web portal designed for users to find, share, and develop 3D-printable and other computer-aided design (CAD) models. While it hosts various CAD files, its primary distinction—and the source of immense controversy—is its extensive library of files for firearms and small arms technical data. In its own words, DEFCAD is "a repository for small arms and 3D2A (3D printing for the Second Amendment) technical data," built to serve as "a public good and an ongoing, standardized resource for the American rifleman and gunsmith."
: Advances in 3D printing technology have made it more accessible and affordable for individuals to produce their own firearms or components, raising concerns about the effectiveness of current regulations. defcad files repository 2021
The 2021 repository was not static. Major technical updates included:
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Despite the paywall, the 2021 "Open Source Defense" community maintained a subreddit (r/DefCAD_Downloads) where users shared Google Drive links to specific prints, causing a constant DMCA whack-a-mole.
Proponents argued that DefCAD was a free speech library. As Cody Wilson famously argued in a 2021 livestream: "CAD files are math. Math is speech. You cannot ban geometry." While it hosts various CAD files, its primary
DEFCAD transitioned to a paid subscription service. To access the files, users had to pay an annual membership fee.
The DEFCAD files repository of 2021 was more than a download hub. It was a cultural artifact of a moment when distributed manufacturing collided with constitutional rights. For every user who printed a perfect Glock frame on an $200 Ender 3, there was a lawmaker drafting a bill to criminalize the file.
Throughout 2021, several U.S. states moved to pass laws specifically targeting "ghost guns" or unserialized firearms. These laws often focus on the possession of components that lack serial numbers or the act of manufacturing them without a license.