It seems science fiction but is not. A company is now 3D printing livers for use in testing drugs. The livers are tiny yet mostly functional. One goal is to have fully functional 3D printed livers available for transplants.
San Diego-based bioprinting company Organovo has successfully created functional 3D-printed livers—albeit very, very tiny ones. At half a millimeter deep by four millimeters wide, the livers will likely be used for medical tests, but Organovo hopes that they will soon produce full-sized livers that could do away with agonizing waits on long transplant lists.