For the first time, cardiac and vascular structures were 3D printed in a microgravity environment using adult human stem cells. Three companies led by NASA contractor Techshot Inc. developed a "space hardened 3D bioprinter" prototype to accomplish the feat aboard a Zero-G parabolic flight. The benefits of the microgravity include the use of lower viscosity bio-inks and more.
3D Printing In Space: A New Dimension (Photo Gallery):
http://goo.gl/ALp5p9
Credit:
Space.com / footage courtesy: Techshot Inc. / Edited by @SteveSpaleta