Printable circuit items always catch my eye. Â The idea of being able to work up a project and share it far and wide in a common easy to work with material has its charms. This then caught my eye….
Of note …they figured out a way to make a printed ardunio clone using their pen and a plotter.  (Paperduino: How to Print a Paper Arduino) 
Circuit Scribe is a rollerball pen that writes with conductive silver ink. It makes creating circuits as easy as doodling.
