Advances in 3-D printing have given us the ability to manufacture prosthetics, auto parts and clothes on demand. Are human organs next? It’s a possibility, according to Shayn Peirce-Cottler, who heads a University of Virginia bioengineering lab. Peirce-Cottler and her team are making baby steps toward that goal using a state-of-the-art bioprinter that can fabricate human tissue and bone. In the meantime, they’re using the machine — just one of three in the United States — to solve some practical clinical problems.