Pretty cool, huh? Need a kidney? Print one out. In outer space and you have to fix something outside your spaceship? Print an android.
So far cartilage is doable, and as mentioned, various medical devices and spare parts, but no organs. Hod Lipson would have you believe they will be doing that soon. I am skeptical, but really hope to be proved wrong. They have been experimenting with items using four or five different materials. Many of these have been successful. They have printed a real battery that works. Now they have moved on to a current goal of creating a remote controlled robot that will walk out of the printer and they expect to complete it within two years.
I definitely have faith in its incredible ability, but I think that some of the futuristic dreams are a bit lofty. The spare liver or lung: For that particular miracle I think we will find the answer in a different area. My money is on regeneration, not a printer. But perhaps we could end up with something like the Star Trek replicator. Rest easy chefs, a machine will probably never be able to replace you. Maybe make the food that you want and make it now, but gourmet and in 30 seconds? NAH!