3-D Printed Hela Cell Tumors (image) Drexel University Caption Fluorescent-dyed Hela cell tumors were created via an additive extrusion process developed by Dr. Wei Sun at Drexel University. Sun designed a multi-nozzle printer that can create living tumor models. Credit Drexel University Usage Restrictions None 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.