I’ve built quite a few omni-directional robots using various types of omni-directional wheels. Normal omni-wheels are a large wheel with smaller wheels around its circumference, allowing it to be driven in one axis, and slide passively in the other. Using three omni-wheels allows a vehicle to move in any direction, although I’ve also built machines with one omni wheel. Most of my omni-wheel vehicles worked ok on flat ground, but they weren’t great at climbing over obstacles. So in this video I’m