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Yahoo News explains: The controversy behind 3D-printed guns

On Tuesday, a federal judge in Seattle temporarily blocked Texas company Defense Distributed from publishing blueprints for 3D-printed guns online. The decision came a day before the schematics were set to become legal, allowing anyone with a 3D-printer to create an untraceable firearm. What’s the deal with 3D-printed guns, and how did we get here? Yahoo News explains.