Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5397628.
A simple re-usable board for making classic or fancy knotted thread friendship bracelets. Definitely better than classic cardboard and lasts far longer. The knobs on the back allow you to hook the loop over them to keep things even more solidly in place as the bracelet gets longer.
Most likely you will have to use an xacto knife to deepen the slits properly unless your tolerances are insanely good, but that's hardly difficult post processing. Just make sure you're patient and wait for the bed to cooldown properly before removing so it doesn't warp unlike yours truly.
There are 3 designs available as well. Diamond (as pictured), hexagon, and a solid version ripe for remixing.