https://www.cnet.com/news/heres-the-first-3d-printed-heart-made-from-actual-human-tissue/

"This is the first time anyone anywhere has successfully engineered and printed an entire heart replete with cells, blood vessels, ventricles and chambers," Professor Tal Dvir, who led the team, said to local press. "People have managed to 3D-print the structure of a heart in the past, but not with cells or with blood vessels."

Scientists have found many medical uses for 3D-printing technology in recent years. Researchers at the University of Toronto are working on using such technology to print skin over wounds, and the University of Minnesota has developed a transparent mouse skull that helps its researchers to better understand brain activity.