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Re: Never Do This, and Other Good Ideas Gone Bad
Relying on gravity to do anything other than to give your robot weight. If it moves down (an arm, an elevator, a ball in a hopper), make it powered.
Ditto scissor lifts and "many-to-one" hoppers. I've seldom (but not never) seen implementations of each that were effective.
Mecanum wheels are on the verge of making the list, too (for the same reason).
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