One method described here is a patient presented with a diseased organ, the organs are then printed out of special materials based on this organ.
The biggest challenge described in the video is creating whole solid organs in their entirety such as a kidneys. The strategy is to take an xray, and to use 3D reconstruction and 3D imaging to view the patients kidney. The researchers then take this information and scan it into a 3D printer. Developing more precise 3D printing technology is critical, to furthering this field.
Researchers at the Feinstein Institute for Medical Research have successfully created cartilage using a MakerBot 3D printer. The team made use of the technology to quickly and affordably prototype and refine the bioprosthesis, and even used it to create a low-cost bioreactor to facilitate the growth of the cells.