3-D Printing of Shape-Shifting Smart Gel (IMAGE) Rutgers University Caption A tiny chess king, 3D-printed with a temperature-responsive hydrogel, in cold water. It contains 73 percent water but remains solid. Credit Daehoon Han/Rutgers University-New Brunswick 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.