Print in place foldable ruler 40 inches long. No supports needed. Printed on Overture white PLA at .20 layer height with .4 nozzle and Prusament PLA default settings. It takes about 12 hrs to print. It has 4 little tabs that act as supports (see pictures), you will need to remove them once the print is ready. You can use a small pick to remove the tabs. Once the tabs are removed, move the pieces up and down to set them free. It will require a bit of force to set the pieces free. Tolerances are really tight. I'm working on adding a metric version.
The author hasn't provided the model origin yet.