Wilson has maintained that he doesn't need a license, because he's not planning to sell the weapon. But Stratasys was not impressed. Wired's Danger Room blog reports that the company's representatives showed up at his door to seize the device. Now he'll have to find another printer--and according to Danger Room, he's considering obtaining a manufacturing license even though he doesn't believe it's legally required. Meanwhile, his group has posted Stratasys' letter online with the caption, "Imagine if your biggest part in the human drama was to stand in the way of an innovation."