I hate pens that leak ink and then it smudges all over your hands as you write on the page. They’re so cheap and the best, in my opinion!” she raves. S-Gel Retractable Gel Pens (Set of 4 ...

[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 ...