Researchers at Denver University are currently working with a 3D bioprinter called BioBots after forming a partnership with Denver’s 3D Printing Store. This will allow them to create made-to-order replicas of organs, tissues and other parts, while they have already started printing custom replicas of heart valves using patients’ MRIs and CT scans.

Source: http://www.thedenverchannel.com/money/science-and-tech/denver-university-researchers-use-3d-bioprinter-to-create-artificial-body-parts