High-area Rapid Printing (image) Northwestern University Share Print E-Mail Caption At 13-feet tall and with a 2.5-feet wide print bed, HARP is the biggest 3D printer to date. Its size allows it to print large, continuous structure or many, different small structures at once. Credit Northwestern University Usage Restrictions None Share Print E-Mail 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.