[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 the ...

The pen is perhaps one of the most momentous discoveries ever. While there is no concrete evidence on when the first pen was discovered, history books point out that the first ever pen was a dip pen ...

At the very tip of a ballpoint pen is, you guessed it, a ball that rolls around and basically stains the paper with ink. Imagine if you dipped your body in paint and then rolled around white carpet, ...