The process of creating the heart began with a biopsy of fatty tissue taken from patients. The cellular material from the tissues was used as the "ink" for the print job. That allowed researchers to create complex tissue models including cardiac patches and eventually an entire heart. It should be noted that the heart is not very big ̵
Researchers have been working on 3D-printed tissues for years, with the eventual goal of creating functioning organs for transplant. The scientists involved in the heart project at Tel Aviv University theorized that within 10 years, organ printers could be available at hospitals.