No cleanroom or solvents needed (IMAGE) KTH, Royal Institute of Technology Caption PhD student Lee-Lun Lai loads a tray into a 3D microprinter to demonstrate how polymer transistors can be made faster, cheaper and more sustainably. Credit David Callahan-KTH Royal Institute of Technology Usage Restrictions Credit must be given to the creator. License CC BY 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.