Sun - Eiffel Tower, twisted (IMAGE) Northwestern University Caption This tiny Eiffel Tower was produced using a new dynamic 3D printing method that has the ability to change printing direction on the fly. Credit Northwestern University Usage Restrictions Credit must be given 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.