https://phys.org/news/2018-08-states-aim-internet-3d-printed-gun.html

Nineteen states and the District of Columbia sued and last month secured a restraining order to stop that process, and now they want to make that permanent by having the judge convert the restraining order into an injunction. They fear the plans, if disseminated online, could be used by people who are not legally permitted to buy or possess guns. Critics add that because the weapons aren't made of metal, they would be undetectable.

Cody Wilson, owner of Austin, Texas-based Defense Distributed, has said "governments should live in fear of their citizenry." Wilson's lawyers have said the safety risk from the 3D weapons claimed by the states is largely exaggerated because many of the files are already online.