The US government was criticised for switching its position on the threat posed by the 3D gun-making plans.
A US judge in Seattle blocked the Trump administration from allowing a Texas company to post online plans for making untraceable 3D guns, agreeing with 19 states and the District of Columbia that such access to the plastic guns would pose a security risk.
The states sued to stop an agreement that the government had reached with Austin, Texas-based Defense Distributed, saying guidelines on how to print undetectable plastic guns could be acquired by felons or terrorists.
