Free 

as always: OpenSCAD source for download. Please remix
Three parameters in the source:
- ball_d=90; // the ball diameter - get this from measuring the existing ball/sphere - base_d=30; // the diameter of the base - smaller is nicer but also more instable - base_z=10; // the height of the base disc The .stl in the files is exactly the one above: a 30mm base for a 90mm sphere.












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