[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 ...

It’s a debate as old as time and has had the world’s finest intellectuals at war for years – what is better to write with, fountain pens or ballpoint pens? Okay, maybe it’s not that ...