Cheap alternative to buying hockey balls 

Would recommend 4 walls with 60% infill

Use supports at a 50% overhang angle and block out supports from going past a quarter way up the ball

Print it at 0.12mm for a more aesthetic top and bottom of the print but not necessary if you are only worried about functionality and want to save on print time

Ball should weigh 160gm to be regulation weight so you can tweak a few settings if its not as heavy or light as desired

Enjoy!