The following clip is from National Geographic, so that should answer the question of whether or not this is a joke. It ain't.
I don't think "3D Printer" is the best name for this machine, because to me that conjures the thought that it shoots ink over three dimensional items, rather than just on two dimensions (paper). This thing does more than that. It creates an object. To your specifications. Top to bottom. Using what's referred to in the video as a composite material, to which a binder is then added. And then colours it as you please.
As astounding a technological leap forward as this seems, I can't help but think that this is the Atari of its kind. If this catches on, what will 3D printers be pumping out in a year's time? In five? Twenty? Clean-burning internal combustion engines? Gold? Oranges? Kittens? Kidneys? Jimi Hendrix?
Actually, this other company's 3D printer supposedly has already "printed" chocolate.
Welcome to the future.