Above:Solved
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The concept of the Ghost Cube applied to the Gear Cube.
The inventor had the idea of the Ghost Gear Cube months ago, but designing spherical gears was a complete mystery for him at that time. Thanks to Timur Evbatyrov for his precious pdf "Designing geared 3D twisty puzzles" through which he could learn anything needed to achieve this design.
Edge length: 60 mm
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