Spherical Threaded container 6.85 cm Diameter

This is a spherical container of diameter 6.85 cm (size of a tennis ball). It has a 1 cm long thread and screws together quite tightly. This can be used for containing small items such as coins, jewellery or other bits and bobs. The original reason for this design was to a create a water tight spherical container for a buoyancy physics experiment. So this could be used for that. I printed this design with a 0.08 mm layer hieght to ensure a smooth surface. However with the uploaded print profile I used probably more support than needed so the ball required a bit of sanding to smooth out on the top and bottom. Suggestions about the print profile and a better way too print this without causing rough surfaces on the model would be greatly appreciated. Thanks!I