Emma W's Sphere.
thingiverse
A personalized rendition of the design at http://www.thingiverse.com/thing:155394 was made using the Customizer tool (http://www.thingiverse.com/apps/customizer/run?thing_id=155394). The specifications for this custom version are as follows: top squish of 4, wall thickness of 5, bottom squish of 6, top axle diameter of 20, bottom diameter of 28, bottom axle diameter of 0, outer sphere diameter of 40, and a smoothness level of 100.
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