Shoe Pad Repairing Itself (IMAGE) University of Southern California Caption This is a severed 3D-printed shoe pad repairing itself. Credit An Xin and Kunhao Yu Usage Restrictions None License Licensed 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.