Easy sphere with support, quick to print if the right infill settings are chosen. Part A must be printed twice since both sides of the sphere are the same.
The tolerances on the threads (joint and inner sphere) are quite loose so they can be tightened by hand. There's a small indent on every part in case you don't want to use your hand.
Just a decoration print, or an idea in case you want to print a sphere with supports. I uploaded this simple model to test how the upload system works, but it can be useful for some.
CATIA V5 with no parametrization, since it's a test print.