[u407]’s 3D printed Signspinner was created as a clean/dirty indicator for a dishwasher, and at its heart is a mechanism that works a lot like that of a retractable ballpoint pen. Every click of ...

And at $725 (that's about £547), this augmented pen and paper combo is quite the investment, but then again it's a bargain compared to Montblanc's fortune-destroying Montblanc Stylus that clocks ...