The complexity of a pediatric heart is immense. When cardiac surgeon Erle Austin was preparing to operate on the heart of a 14 month old, he turned to his colleagues with the patient's heart images. But to his disapointment, he was receiving conflicting opinions as to how he should operate to save the patient. To his surprise, a 3D printed model of the child's heart enabled surgeons to prepare in exquisite detail for the operation. The model allowed Dr. Austin to understand exactly what he needed to do, and how he had to do.