Researchers at MIT’s CSAIL computer science lab announced that they can print working robots on one 3D printer, from a single print, that can practically "walk right out of the printer". The robots, which need to be hooked up to a battery source, are made up of solid and liquid parts, which could have big implications on how we design robots to interact with humans in the future.
http://qz.com/655504/mit-scientists-created-a-working-hydraulic-robot-from-a-single-3d-print/
http://qz.com/655504/mit-scientists-created-a-working-hydraulic-robot-from-a-single-3d-print/