Heart Simulator (IMAGE) Massachusetts Institute of Technology Caption Custom, 3D-printed heart replicas are patient-specific and could help clinicians zero in on the best implant for an individual. Credit Melanie Gonick, MIT Usage Restrictions Images are made available to non-commercial entities, press and the general public under a Creative Commons Attribution Non-Commercial No Derivatives license. You may not alter the images provided, other than to crop them to size. A credit line must be used when reproducing images. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.