Sam's test Captive ball
thingiverse
A tailor-made adaptation of http://www.thingiverse.com/thing:195435 was generated using the Customizer at http://www.thingiverse.com/apps/customizer/run?thing_id=195435. The specifications used were sphere radius 2 with a diameter of 19, sphere radius 1 with a diameter of 22, a cube width of 20, and an opening radius of 6.5 to create your custom design.
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