MIT team takes a major step toward fully 3D-printed active electronics
MIT team takes a major step toward fully 3D-printed active electronics
news.mit.edu
MIT team takes a major step toward fully 3D-printed active electronics
Researchers produced 3D-printed, semiconductor-free logic gates, which perform computations in active electronic devices. As they don’t require semiconductor materials, they represent a step toward 3D...

Even though it's only research and nowhere near silicon in terms of effectiveness, I find the prospect of maybe one day being able to print simple circuits very exciting :)