A 3D-printed submarine? Not likely, but maybe something close

More and more U.S. warship and submarine parts are being 3D-printed—and now the Navy is going after the “really hard problems,” a top official says.“I could go anywhere in the Navy, and you will see additive manufacturing, but it's not solving our biggest problems," Christopher Miller, the executive director of Naval Sea Systems Command, said during Govini's Defense and Data Summit in Washington, D.C., on Wednesday.But in the last year, the Navy—especially its Marit