Researchers from multiple respected institutions have collaborated to create 3D printed silicone guides which have been successful in the actual regeneration of complex nerves. While it's rare to be able to regenerate nerves that have been severely damaged, researchers have had success with the 3D printed guides, testing on rats, after reverse engineering their sciatic nerves--and then repairing them. Read more about the latest at 3DPrint.com: http://3dprint.com/96504/3d-print-silicone-guide-nerve/