I've got my Pololu 3pi programmed to get to a specific area then scoot a bit closer and turn the motors off, there is enough power for the motors or the fan but not both at the same time. The fan is not on it yet so it just flashes the red and green LEDs for now. It then spins and returns along the line. The time is under thirty seconds even with a generous five second time to blow out the candle.
Still to do: build an extension platform to hold the fan. The chassis has four pre-drilled holes for an extension which is convenient.
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