"In a major victory for common sense and public safety, a federal judge just granted our request for a nationwide temporary restraining order - blocking the Trump administration from allowing the distribution of materials to easily 3-D print guns", New York Attorney General Barbara Underwood said in a statement.
3D printers have become much more accessible and that's made it easier to make these guns.
Republican leaders say existing laws on the books already outlaw the private manufacturing of guns and undetectable firearms, and require any firearm made to contain metal.
Advocates for gun control have argued that 3D-printed guns could also pose security challenges as they pass through airport X-ray machines.
The company's website had said downloads would begin today, but blueprints for "the Liberator", a single-shot.380-caliber plastic pistol has been posted on the site since Friday.
Wilson's blueprints had been posted on Defcad before the court order took effect and had already been downloaded thousands of times.
The company filed its own suit in Texas on Sunday, asserting it's the victim of an "ideologically fuelled program of intimidation and harassment" that violates the company's First Amendment rights.
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This morning, President Donald Trump seemed to indicate opposition to Defense Distributed's publication of the designs on Twitter.
Cody Wilson, founder of Defence Distributed, first published downloadable designs for a 3D-printed firearm in 2013.
Trump spokesman Hogan Gidley made much the same point, saying the administration supports the law against wholly plastic guns, including those made with a 3D printer. Some gun rights groups say the technology is expensive, the guns are unreliable and the threat is being overblown.
That's right, Americans could legally manufacture a weapon for personal use, without a serial number, making it untraceable and in some cases undetectable by metal detectors.
A U.S. federal judge in Seattle has blocked the release of software that allows consumers to 3D-print firearms. The petition for the temporary restraining order was filed in federal court in Seattle.
"They are undetectable, they are untraceable", said Sen. "We're going to dare these eight attorneys general to challenge us", said Mr. DeLuz.
Another hearing will be on the 10th August.
"We were disappointed in the ruling and view it as a massive prior restraint of free speech", Blackman said.
"I have a question for the Trump Administration: Why are you allowing unsafe criminals easy access to weapons?"