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good question. you don't need pwm for these fans so any +/- connection on the board works, for example you have the 6 endstop headers (+-S) - in most printers you only use 3 out of 6 for endstops. Then there is a 12v 2-pin connector near the fuses - might need to be populated. if you don't use the 2nd extruder you can pull from there too.