I've been following that for a while. They already printed a functional liver (I think in Sweden), and their goal is to print a heart. While this is fine and dandy, what is even better is what some have predicted to be on the horizon: not printing A heart, but printing YOUR heart. A paper I read (sorry...don't have the link) suggests that through advances in bioprinting and the completion of mapping the human genome, they may be able to take a smaple of your DNA, refine a genetic flaw that caused a genetically produced disease/attack/etc, and transplant with either your younger heart, or one that is superior to your previous one. One great benefit of this is the predicably low rate of transplant rejection.
Have you checked out the biopen they unveiled? Still being tweaked, but they say it may be in hospitals by 2016!
Printit Mason and Printit Horizon printers
Multiple SD2s- Bulldog XL, E3D v5/v6/Lite6, Volcano, Hobb Goblin, Titan, .9 motor, Lawsy carriages, direct Y drive, fishing line...the list goes on
Filawinder and Filastruder #1870.....worth every penny!