A 3D printed human heart may seem like something that may come in the distant future, but Dr. Stuart K. Williams believes that by 2023, such an accomplishment will likely have taken place.

http://3dprint.com/869/3d-printed-hu...top-scientist/

In fact he and his team are already working on the machine that will eventually print out the hearts. Such an advancement would save thousands of lives every year in the US alone. The current obstacles are related to printing out the organ with working blood vessels. Do you think Williams' estimates are accurate?