by ark19, published
A sphere made up of 2x Hemispheres and a threaded hollow cylinder. Does not require supports.
Update 8 Aug 2013:
Added Sphere D42.stl and Sphere int H25.stl
This is a bigger version and can be printed separately.
Added ear rafts to prevent lifting.
Download and print SphereAssy.stl
I printed it with 10% fill, no support.