I can move the fan along the X axis in order to aim at the "hot spot". If there were more than one, far apart from each other I'd have to use a second fan.
Of course the air flow is stronger close to the fan. But the basic idea simply is, throwing as much air as possible onto the print and don't care about the details I could even add a second or third battery, the fan is rated for 3 something Volt. But that would literally blow everything away - and sound like a real drone flying next to the printer.
You should print a bunch of robots on different locations on the bed to see if the effect is the same everywhere.
But I guess the robots in the back will be hidden from the fan?
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