The Guardian has published an interesting article about using 3D printers for creating human organs. The idea is quite simple: if you have the required tissue types, the 3D printer is able to print the organ you want. Organs are three-dimensional structures, and because they are standardized, their structure could be stored in a computer file.
Combined with the ongoing developments in stem cell research, this technology might make organ donation obsolete by 2050. This is great news for space colonists, at least if they would need an organ transplant in outer space. If an organ needs to be sent from Earth, it would take months before it arrives at a space settlement in the Earth-Sun’s Lagrange points or in the Asteroid belt. Even if the organ would survive the transport, it might arrive too late for the patient.