Few days ago, I tried to print a real sized bowling ball. It was easy to design since it's just a sphere but printing was different. There were steep overhangs, printing time took days, it was too big for small printers, and 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.
You will be able to print a sphere twice as big as your build space. e.g. If you have 200x200x200mm build space, the maximum size of the sphere you can print with this model is a sphere diameter of 400mm.
Print 4 copy of big_sphere_barrell, 2 big_sphere_TL, 2 big_sphere_TR. Then glue them together.