Print one of each set (the red/white/inside parts are all 2 in the file) with the black base and glue it together!
The base slips over the top button of a shirt. This version was really quick-and-dirty... I'm going to do a version two which is sized and has room inside for the Pokemon Go Plus Bluetooth accessory.
I used glow-in-the-dark for the gray interior of the poke-balls but you do you! My students loved it!
I used 3 walls and 30% fill at .3 res, but I bet almost anything would work!
Glue it together and catch 'em all!