Buying a 3D printer is exciting, but you'll need projects and models to make it all work. These free sites offer a huge range ...

Breakthroughs, discoveries, and DIY tips sent six days a week. Terms of Service and Privacy Policy. A crewed submarine is, at its most elemental level, a machine ...

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 ...