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If there was no "up" alignment for the robot, it seems that the motors would just spin the core, rather than spin the wheels. If you did give it a gravitational alignment and ran into something with your wheels (say a crate,) they would get stuck on the object and again the core would spin and the robot would not move. If you did have some way to brace it against the ground or it was very heavy so that the motors would have something to push against when powering the wheels, it seems like it might be a nice, simple, compact design.
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