A doctor who pioneered 3D printing nearly perfect ears says 3D printing stem cells directly into injured spines would allow them to self-repair. He’s already  successfully done it with mice.
Scientists at Cornell University, led by Dr. Lawrence J. Bonasser, are pioneering a spinal surgery that sounds like something straight out of science fiction. Utilizing 3D printing techniques loaded with stem cell-infused bio-ink, they aim to repair the degenerative spinal discs of 30 million ailing Americans