The file 'Smooth Sphere 3D Printer Model' is (STL) file type, size is 165.9KB.
This sphere has a 24mm radius.
I couldn't find any spheres on here with a high enough poly count for lead casting, so I made one.
Edit: I added another file, this one with the sphere cut in half, as printing the ball on my solidoodle2 did not come out nearly as clean as I wanted. Even with supports the bottom half of the spheres were a mess, so instead I printed the hemispheres (flat side down of course) and they came out perfectly.
hemisphere_24mm.STL | 177.9KB | |
sphere_r-24mm.STL | 285.8KB |