3D printing of humans organs also called 3D bioprinting
http://en.wikipedia.org/wiki/3D_printing
http://en.wikipedia.org/wiki/3D_bioprinting
You can probably print organs in the future like heart, kidney, liver etc. Donor transplantation might be a history.
Look at this videos:
https://www.youtube.com/watch?v=_RO5DSIB1GE