A new 3D printing technique from MIT’s Computer Science and Artificial Intelligence Laboratory has allowed researchers to “print” all of the parts of a robot, both solid parts like the body and liquid components such as hydraulic pumps, at the same time.
The result is rather marvelous: The researchers were able to print fully assembled robots, without any human intervention needed. “All you have to do is stick in a battery and motor, and you have a robot that can practically walk right out of the printer,” said Daniela Rus, who oversaw the project and co-wrote the paper about the “printable hydraulics” technique.

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