Last week, an article in a leading naval journal in the United States suggested that complex parts of ships and aircraft could be \"printed\" out soon, and many suspect that it was a stupid prank in April. However, this proposal is not a joke. It refers to a revolutionary technology that can achieve three Size objects printed in a variety of materials, including plastic, metal and concrete. Lieutenant Scott Cheney Peters and Matthew shipur, who wrote papers for the Journal of the American Naval Research Institute, suggested that 3D printers can be used to produce any object needed at sea, from engine parts to meal plates, and even to hurt the sailor\'s artificial limbs. \"3d printing is an incredible opportunity,\" Hipple said.