Cheap alternative to buying hockey balls 

Would recommend 4 walls with 55% infill to achieve maximum strength and an ideal weight

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

I recommend printing 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 about 160gm without supports to be regulation weight so you can tweak a few settings if its too heavy or light

Enjoy!