Defense Distributed is a collective that raised $20,000 in BitCoins to lease a 3D printer and develop and prototype a 3D printed pistol. Stratasys, the manufacturer of the printer, seized it from the home of Defense Distributed's Cody Wilson, after a heated email exchange in which the Stratasys counsel said that "It is the policy of Stratasys not to knowingly allow its printers to be used for illegal purposes. Therefore, please be advised that your lease of the Stratasys uPrint SE is cancelled at this time and Stratasys is making arrangements to pick up the printer."

Robert Beckhusen writes more in Wired:

"They came for it straight up," Cody Wilson, director of Defense Distributed, the online collective that oversees the Wiki project, tells Danger Room. "I didn't even have it out of the box." Wilson, who is a second-year law student at the University of Texas at Austin, had leased the printer earlier in September after his group raised $20,000 online. As well as using the funds to build a pistol, the Wiki Weapon project aimed to eventually provide a platform for anyone to share 3-D weapons schematics online. Eventually, the group hoped, anyone could download the open source blueprints and build weapons at home.

Until Stratasys pulled the lease, the Wiki Weapon project intended to make a fully 3-D printed pistol for the first time, though it would likely be capable of only firing a single shot until the barrel melted. Still, that would go further than the partly plastic AR-15 rifle produced by blogger and gunsmith Michael Guslick. Also known as "Have Blue," Guslick became an online sensation after he made a working rifle by printing a lower receiver and combining it with off-the-shelf metal parts.

But last Wednesday, less than a week after receiving the printer, Wilson received an e-mail from Stratasys: The company wanted its printer returned. Wilson wrote back, and said he believed using the printer to manufacture a firearm would not break federal laws regarding at-home weapons manufacturing. For one, the gun wouldn't be for sale. Wilson added that he didn't have a firearms manufacturers license.