This is a collection School a design for the portable chair contest.  It takes around 35 hours on my Ender 3 with 4 mm layer Height. If you want to print it small I would not recommend going below 25% size otherwise the tallest is may become too tight. 

If you watched the GIF and wondered what those  rectangle things are  there just pegs used to lock the legs in place when it's open as well as closed. Finally although in the pictures you don't see the holes on the top of the stool in the model I uploaded there are small rectangle cutouts so that if you print multiple of these stools they can stack on top of each other nicely.