https://techcrunch.com/2018/07/30/newly-legal-3d-printed-gun-blueprints-targeted-by-state-lawsuits/

Hot on the heels of the effective legalization of 3D models used to print firearm components, 21 states have filed a joint lawsuit against the federal government, alleging not only that decision is dangerous but also that it’s illegal for a number of reasons. But the lawsuit may backfire via the so-called Streisand Effect, further entrenching the controversial technology.

Earlier this month brought the news that the U.S. government dropped its case against Cody Wilson and his companies dedicated to the proliferation of 3D models of firearm parts. There are still restrictions on how guns can be made and sold, but the files containing 3D data and allowing people to print components seem to have been determined not to fall under those rules.