Washington state Attorney General Bob Ferguson, pictured in 2017, is leading a multi-state lawsuit to prevent 3D-printer gun plans from being published on online.

Washington state Attorney General Bob Ferguson, pictured in 2017, is leading a multi-state lawsuit to prevent 3D-printer gun plans from being published on online.

Washington state Attorney General Bob Ferguson, pictured in 2017, is leading a multi-state lawsuit to prevent 3D-printer gun plans from being published on online.

Washington state Attorney General Bob Ferguson, pictured in 2017, is leading a multi-state lawsuit to prevent 3D-printer gun plans from being published on onlin