Nanotube model (IMAGE) Ruhr-University Bochum Caption 3D printed model of a carbon nanotube, the main building block for the new biosensors. Unlike in this 3D printed model, the real nanotubes are 100,000 times thinner than a human hair. Credit RUB, Marquard Usage Restrictions The image may only be used for reporting about research at Ruhr University Bochum. 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.