Using a combination of solid and liquid printing, MIT printed the first ever 3D Printed Hydraulic Powered Robot. No assembly was required, beyond popping on a motor and battery. Which means now our Evil Robot Overlords will be able to print up their minions themselves. The advance that made this possible was developing a technique to print both solids and liquids in the same printer, and I find it somewhat surprising that they got the best results for the liquid printing using a regular ink jet printer.
