New type of photoconducting 'ink' enables 3D printing of electrochemically switchable, conducting polymers using fast Digital Light Processing.

https://www.eurekalert.org/news-releases/1105890

"allows manufacturing of complex 2D/ 3D structures... methacrylate-based 'ink' contains redox-active carbazole groups allowing resulting polymer structures to donate or accept electrons, making them electrically conducting so can reversibly change color depending on their oxidation state... ability to manipulate properties down to pixel level/ control color in 3D (height) opens up new possibilities for the additive manufacturing of optoelectronic devices such as pixel displays or actuators for soft robotics"

Related: From Artificial Organs to Advanced Batteries: A Breakthrough 3D-Printable Polymer
https://engineering.virginia.edu/news-events/news/artificial-organs-advanced-batteries-breakthrough-3d-printable-polymer