Printing a Metallic Spider (IMAGE) North Carolina State University Caption Researchers have developed a metallic gel that is highly electrically conductive and can be used to print three-dimensional (3D) solid objects at room temperature. Printed objects can be engineered to change shape as the gel dries; a phenomenon called '4D printing,' with the fourth dimension being time. This image shows a metallic spider that was printed at room temperature using the metallic gel, and which assembled and solidified into its final 3D shape via 4D printing. Credit Michael Dickey, NC State University Usage Restrictions Image credit must be given. License Original 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.