The suit, filed Monday in Seattle, asks a judge to block the federal government's late-June settlement with Defense Distributed, which allowed Wilson's company to make the plans available online.
The controversy centers on Defense Distributed, a firm that began publishing gun designs in 2013, but was told to stop soon thereafter by the US State Department.
The company said in court that they began distributing gun files early and that 1,000 people had downloaded 3-D plans for AR-15s since Friday. Durkan said while she was the U.S. Attorney for Western Washington her office considered 3D-printed guns a unsafe threat for countering terrorism, especially in how the plastic guns could be brought onto commercial flights.
"Some of these weapons may even be undetectable by magnetometers in places like airports and government buildings and untraceable by law enforcement", the letter said.
The hearing before U.S. District Judge Paul Diamond came in response to a lawsuit filed by state Attorney General Josh Shapiro, Gov. Wolf, and the Pennsylvania State Police. A federal court ruled Sunday that residents of Pennsylvania will not be permitted to download plans to print these guns on 3D printers.
In the 16-page filing, attorneys for DefDist hold that Grewal and Feuer "have waged an ideologically-fueled program of intimidation and harassment against" the company, intending to drag Wilson "before all manner of far-flung criminal and civil tribunals in an effort to silence the organization".
"This unprecedented move is not only disastrous for public safety but undermines our state laws meant to keep firearms out of the hands of risky individuals".
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Some states said they're taking action.
Ferguson announced Monday morning that he will file a lawsuit asking for a federal court to block the distribution of 3D printed gun designs.
Files showing how to replicate the process were immediately made available on the Defense Distributed website and downloaded hundreds of thousands of times.
He successfully argued that the US Constitution's Second Amendment, which guarantees the right to private gun ownership, should extend to a person's right to make guns at home - uncontrolled by authorities, since they will bear no serial number. But due to the pending legal battle, Wilson has chose to abide by the cease-and-desist orders, and will not make DEFCAD available in Pennsylvania, New Jersey, and Los Angeles.
Wilson was quick to hail the move as step toward victory in his broader campaign to sabotage USA gun control efforts.
Second Amendment Foundation founder Alan Gottlieb called the settlement with the federal government "a First Amendment victory for free speech" and "a devastating blow to the gun prohibition lobby" in a statement.