I'd like to present the Evil Doppelgänger of the Gear Cube Extreme. Video on YouTube is located here:https://www.youtube.com/watch?v=BbbK7BCWub8
Like the Gear Cube Extreme there are 2 axes connected with a 1:1 gear ratio and 1 free axis. However here the free axis is fixed between the white and yellow faces. On the Gear Cube Extreme, since the gears are connected to the edges, the free axis moves about the puzzle. From a group theory perspective the Gear Cube Extreme is the Group defined by the set of operations (L,R,Us*U2,Fs*F2) and the Evil Doppelgänger of the Gear Cube Extreme is the Group defined by the set of operations (L,R,U*D,F*B).
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White Face is free to turn on its own
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So is the Yellow Face
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Red and Orange Faces are connected with a 1:1 gearing ratio
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So are the Blue and Green Faces
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Checker Board Pattern
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Closeup showing that the gears can be seen through the openings in the edge pieces
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This puzzle was first discussed by Bram here:http://twistypuzzles.com/forum/viewtopic.php?p=306677#p306677
This is one of the possible assemblies of the Gear Cube Kit. And this is the very puzzle shown in this thread.Multi Gear Cube Kit version 2.0
The outer 3x3x3 pieces have been sealed by dipping them in a solution of acetone and superglue. Here is an image showing what the pieces looked like before the sealing process.
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Version 3.0 has already been printed with some very minor tweaks and I also want to test another sealing method with that puzzle. But overall I'm actually very happy with the acetone and superglue method.