A team led by biomedical engineer Adam Feinberg at Carnegie Mellon University in Pittsburgh, Pennsylvania, can now print 3D biological materials that don’t collapse under their own weight as they form. Freeform Reversible Embedding of Suspended Hydrogels (FRESH) was introduced by Feinberg and his colleagues to tackle the collapsing issue with previous materials.
Source: http://www.sciencemag.org/news/2015/10/3d-printing-soft-body-parts-hard-problem-just-got-easier