Tsuyoshi Takado, a professor of the Graduate School of Medicine of the University of Tokyo, printed a an artificial ear, made of polyactic acid with a 3D printer.

The Japanese professor displayed the artificial ear at his laboratory in Tokyo on Friday. 
Takato said his team had been working to create "a next-generation bio 3D printer", which would build up thin layers of biomaterials to form custom-made parts.

His team combines stem cells - the proto-cells that are able to develop into any body part, and proteins that trigger growth, as well as synthetic substance similar to human collagen, the professor added.