Foldable Ruler (13in/33cm)

This is a foldable ruler ready to be 3D-printed! It is 13 inches (1ft 1 inch) or 33 cm (1/3m) long, although the measurements are not marked. To assemble, you will need 4x8x3mm flanged ball bearings (link below) and 1/2" 6-32 or 3x15mm M3 bolts (any bolts fit fine but these are the best). As an American, I marked inches, but feel free to use metric measurements!

Link for ball bearings: https://www.amazon.com/gp/product/B01AS5BPK0/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1