"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." In a digital heavy world, pen and paper have never been more important. Perhaps only a decade ago, ...

[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 ...