Over 3 million patients in the United States need tissue transplants, with more than 100,000 patients on the national transplant waiting list. Unfortunately, many of these people die while waiting for a donated organ. The Health Enabling Advancements through Regenerative Tissue Printing (HEART) project proposes to advance multiple technologies, including the optimization of purity and scalability of human cells, improved 3D printing technology and speed, advances in computational modeling, and novel approaches to organ maturation and implantation. The end result is the 3D printing of a human heart in one hour. This ambitious project has the potential to revolutionize the fields of human tissue and organ printing through large advances across multiple technologies. HEART could create a world where a doctor could 3D print an organ for their patient instead of waiting for a donor, effectively ending waitlists for transplants. This advance would improve the lifespan and quality of life for many Americans and provide broader patient access across all communities.