MIT and the Singapore University of Technology and Design (SUTD) teamed up to create a new kind of structure that can “remember” its original shape, and return to that state even after being deformed. It is able to printed onto a liquid resin using light from a projector, which MIT says is basically what happens when dentists 3D print replicas of teeth or cavity fill.
Source: http://news.mit.edu/2016/3-d-printed-structures-remember-shapes-drug-delivery-solar-panel-0826