A re-creation of an old brainteaser. I think it is of Soviet origin, and called something along the lines of "7 Game". This puzzle is pretty easy, but good for beginners. Simply mix up then re-arrange the numbered tokens.
Support is needed on the main body to print the retaining lip. Print one main body, one of each token, and two plugs. The plugs will friction-fit if your tolerances are right, but otherwise you can glue them in when you've completed filling it with tokens. There is a lot of space on purpose. Like I said, this is an easy one!
Default size is pocket-sized, but it should scale up with no problems.
Edit: Uploaded revised main body and plug in order to minimize parts falling out on high-tolerance prints.