SMILES Materials Under White Light and UV (IMAGE) Cell Press Caption This image shows how 3D printed gyroids made with SMILES materials are colored under white light and fluoresce brightly under UV. Credit Amar Flood Usage Restrictions Credit Required. 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.