[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 ...

Without further ado, we’ve curated a selection of the best highlighter pens to supercharge ... this 12-piece wonder by Writech contains four gel pens, four retractable highlights and four ...