Scientists have been working hard to develop 3D printed blood vessels that are capable of surviving and doing the crucial work of transporting blood, nutrients, waste and other materials throughout the body, but it's been a difficult slog; most existing methods of 3D printing blood vessels are slow, expensive, and are capable of producing only single blood vessels that can't be integrated with the body's natural vascular system. This week, however, nanoengineers at the University of California, San Diego announced that they have 3D printed blood vessels that branch out into smaller vessels, creating a network that can safely and effectively integrate with the body's vascular systems to circulate blood. Read more at 3DPrint.com: http://3dprint.com/166816/3d-printed...essel-network/