Can anyone tell me where to connect a cooling fan on the Sanguinololu v1.3a board? A few of the information pages mention three PWM outputs: Extruder, bed heater and fan, but none of the wiring diagrams that I can find, actually show the connections for the fan.
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It appears that there isn't an "out-of-the-box" solution to your request, but luck is with you. Someone with your board and objective has posted what appears to be a reasonable modification:
http://www.instructables.com/id/Add-a-Cooling-Fan-to-your-Rep-Rap-Sanguinololu/

fred_dot_u
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Yes, this confirms what I was beginning to think and it is a mod I can handle. Thanks. – typhonic Jul 19 '16 at 21:14