I created this model using a surface from Surface Evolver.
The added Sphere at the bottom is hollow.
On top and bottom of the Sphere there is a 10mm cut hole - so if you 3D print it with Stainless Steel the Steel powder can be poured out.
(I dont like Shapeways low quality post processing so i dont recommend them)
Wall thickness: 2~3mm
This design is licensed under the Attribution - Non-Commercial - Creative Commons license.
© 2012 by Dizingof