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Interesting problem! I don't have a RUMBA board to try and looking at the pictures indeed there doesn't seem to be a clean, good spot on the main board itself, but how about this crazy idea: attach the brackets to the stepper shield(s) directly? ☺That way the fan is also in the right place. Alternatively generate a bracket that goes length-wise and make it wide and strong enough to hold the fan in two screws (as there doesn't seem to be enough room for two brackets like the usual case)