3D PRINTING MEETS STEM CELLS. “Medical researchers have been reproducing human cells in laboratories by hand to create blood vessels, urine tubes, skin tissue and other living body parts. But engineering full organs, with their complicated cell structures, is much more difficult. Enter 3-D printers, which … can reproduce the vascular systems required to make organs viable.”
http://www.cnn.com/2014/04/03/tech/innovation/3-d-printing-human-organs/