Portability is a sticking point for many writing implements. We’ve seen retractible pens, pens with caps that extend the body to normal lengths, and flat out tiny pens, but a pen that folds in half? Not until 3D Printed Concept’s D180 Folding Pen. Unfold its body to extend the ink cartridge, then fold it right […](Visited 127 times, 127 visits today)