This is a piece that I designed since my school often has me get loose leaf books and I didn't want to buy a new binder to place it in.

I own a creality ender 3 and didn't have the build plate volume to print a full 11" version. However, I'll be making the full length one in case you do have a build volume capable of printing it.

No assembly requires, it snaps shut after putting your hole punched loose leaf book into it.
it prints flat and folds.