Folks will be up in arms … and legs and muscles. The Wake Forest Institute for Regenerative Medicine has rolled out its new 3-D printer, which they say can manufacture living tissue. Past technology has had trouble creating stable tissue that could stay alive long enough to be implanted. But the Integrated Tissue and Organ Printing System, or ITOP, uses new materials and structures to surmount those problems. The next step will be testing it for long-term safety before moving forward with human implants.