1:1 scale customizable bowling ball 2

I tried to print a real sized bowling ball ([thing:3347470](https://www.thingiverse.com/thing:3347470)). But there were steep overhangs, printing time took days, it was too big for small printers, and most of all, so much filament was wasted as unneeded infill. This model solves these problems. I separated a sphere into 8 pieces so that I can print it easily and reduced wastes by printing only shells.