https://www.siliconvalley.com/2020/01/24/coalition-of-states-sue-over-rules-governing-3d-printed-guns/

By MICHAEL BALSAMO and CHRIS GRYGIEL | The Associated Press

WASHINGTON  — Attorneys general in 20 states and the District of Columbia filed a lawsuit Thursday challenging a federal regulation that could allow blueprints for making guns on 3D printers to be posted on the internet.