[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 ...

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[Bill Hammack], aka the [EngineerGuy] is at it again, this time explaining how retractable ballpoint pens work. In this excellent video, he describes the simple (but remarkably sophisticated) ...

Shigeru Ban has designed a retractable, refillable "SCALE" pen for ACME Studio that was inspired by the architect's ruler. The aluminum pen, designed to fit comfortably into your hand, serves as a ...

To achieve the satisfying look of an error-free written page, an erasable pen is a must-have. The best erasable pens write smoothly and erase cleanly without leaving residue or tearing pages. Erasable ...

We tweet. We text. We email. But how often do we really write anymore? Not much, if you look at the business of selling pens — or "fine writing instruments," as shop owners call them. With their ...