Inside 3-D Printed Blocks (IMAGE) Michigan Technological University Caption One way 3-D printing saves energy over manufacturing is by using less raw material. This series of partially printed Swiss children's blocks illustrates how a 3-D printer can partially fill the interior of an item with plastic while maintaining its structural strength. Credit Samuel Bernier/Thingiverse.com 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.