[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 ...

[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) ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Elissa Sanci Elissa Sanci is a senior writer who has reported on label makers, ...

Confession: I have a desk drawer filled with gel pens in a variety of colors (think neon pink, shimmery gold, deep black and beyond). I use them to write birthday cards for my friends and for my ...

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 ...