But in a reversal that stunned gun-control advocates, the State Department in late June 2018 settled its case against Wilson and agreed to allow him to resume posting the blueprints at the end of July.
Eric Soskin, a lawyer for the Justice Department, later said they reached the settlement to allow the company to post the material online because the regulations were designed to restrict weapons that could be used in war, and the online guns were no different than the weapons that could be bought in a store.
Wilson then wrote on Twitter that he would start back up on August 1, though Everytown for Gun Safety, the Brady Campaign to Prevent Gun Violence and the Giffords Law Center to Prevent Gun Violence were among the groups that then filed an appeal in federal court seeking to block the Trump administration's decision.
U.S. District Judge Robert Pitman ruled against the groups on Friday, July 27, but eight Democratic attorneys general then filed a lawsuit seeking to block the federal government's settlement. They also sought a restraining order, arguing the 3D-printed guns would be a safety risk.
The next afternoon, a federal judge in Seattle issued a temporary restraining order to stop the release of blueprints to make the guns.
President Donald Trump said that he's "looking into" the idea, saying making 3D-printed plastic guns available to the public "doesn't seem to make much sense!"
I am looking into 3-D Plastic Guns being sold to the public. Already spoke to NRA, doesn’t seem to make much sense!— Donald J. Trump (@realDonaldTrump) July 31, 2018
The guns are made of a hard plastic and are simple to assemble, easy to conceal and difficult to trace. People can use the blueprints to manufacture plastic guns using a 3D printer.
Gun safety advocates and some law enforcement officials oppose the release of the documents, worried that firearm blueprints are exactly what criminals and terrorists want: guns that potentially can't be flagged by metal detectors, don't have serial numbers to trace and don't require the usual background checks.
Gun industry experts say the guns are simply a modern-day equivalent of what already is legal and readily available: the ability to assemble your own firearm using traditional materials and methods at home without serial numbers. They argue that 3D-printed firearms won't be a draw for criminals since the printers needed to make one are wildly expensive and the firearms themselves aren't very durable.
The Associated Press contributed to this report.