by evamvid, published
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I can try it again when I get a chance. That said, the way TinkerCAD does it (this is how Robo originally did it) was that it made the Rubiks Cube Part a "hole". which was then centered onto the stormtrooper head.
It's hard to see, but it does look like the rubies_boolean_v5.stl file does have a core piece in the center. I'm not familiar with boolean operations in solid modeling, so I'm not sure I know what I'm talking about there. My guess is that the boolean operation somehow didn't include that core piece.
I can still see my old post. But in case you can't, here it is:
The cube you started with is, I think, the best, because that's all you need. The textured cube for the blind requires gluing together. The regular cube requires screws and springs. This one, though, you just have to separate the parts. It seems like the three approaches are mostly incompatible with each other.
I did successfully print the Vader cube. It's close to the size of a regular Rubik's cube. Action is not as smooth but will probably improve with use.
I examined the stl files using Pleasant 3d(Mac only) in wire frame mode. If you don't have a Mac, I've heard that Repetier Host can also do this. I think both are free. Anyway, I could see that there was a center piece in the Vader cube that was missing in the Stormtrooper cube.
I don't actually know how the 3D modeling is done, but I will guess that the Vader cube has what you need. Maybe it has to do with accidentally subtracting out the center core piece? Or not adding it back in?
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This one works....
I'm working on fixing Yoda (http://www.thingiverse.com/thing:56859) now
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