In a breakthrough study, 3D printed organs have been vascularized to sustain the growing tissue and bring printed organs one step closer to fruition. Currently, hundreds of thousands of Americans are on waiting lists for life-saving organs, and 20 patients die waiting each day. This innovative research by Prellis Biologics is making headway to allow for more effective and efficient printing of organs. 3D printing has had to overcome 2 major obstacles: the development of a biological scaffold to allow for three dimensional growth of cells into the desired organs, and the oxygenation and nutrient delivery to the growing tissue for prolonged periods of printing time using blood vessels. Though a biological medium for 3D tissue growth has already been developed, Prellis has created a more effective an efficient method of vascularizing the growing organ tissue, as well as expediting the printing process as a whole.