But you can't really injection mold this geometry, it'd have to be done in 2 halves, or quarters, and then bonded together, which would make for weird bending p

But you can't really injection mold this geometry, it'd have to be done in 2 halves, or quarters, and then bonded together, which would make for weird bending performance in the area of the weld and therefore make a ball that bounces unevenly