A team of researchers from South Korea's Ulsan National Institute of Science and Technology, led by professor Park Jang-ung, have developed a new kind of 3D printing technique that works not unlike the color printer you have at home. Except that this electrohydrodynamic inkjet uses special inks that can be layered to form microscopic 3D shapes like arched bridges, zig-zag structures, and pillars.

The new 3D printing technique can actually create patterns as small as 0.001-millimeters in size. For comparison, a red blood cell measures in at 0.006 to 0.008-millimeters, so it's actually capable of creating shapes too small for the naked human eye to see.