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Give a child a toy and they're happy for an hour. Teach a child how to make their own toys, and they're happy for life!
The problem is weight and balance, stiction caused by variations of floor surface conditions. One solution is just rotate the wheels; Another solution might be balancing distances from side to side with range finders, but this is limited to special spaces. OTOH, remote control could make this useful, but still rotating the wheels saves $'s not buying expensive mecanum wheels.
OTOH, remote control could make this useful, but still rotating the wheels saves $'s not buying expensive mecanum wheels.