A holder for a 2m ruler that can be attached to a Ikea Skådis pegboard. The inner dimensions fit my ruler, and are:
Measure your ruler before printing this, I'm not sure if this fits most 2m foldable rulers or not.
The design is so that there are no angles steeper than 45 degrees if you print it upside down, and so no supports should be needed for this one.
The design does not need supports. I printed with a raft as I find that works best for my FlashForge Finder.
I measured the thickness of my ruler in both directions using a caliper, and then designed the holder in Fusion 360. I added 1mm of space on all sides for the inner walls to leave a littlebit of wiggle room for my ruler.