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I didn't make any firmware changes to support this mod and the only wiring change from stock was I used the Z axis endstop cable for the Y axis and vise versa, due to the Z endstop cable not reaching since the driver board is mounter further from the switch. The 4 fans are powered directly from the main PSU, so they come on when that is on. I used 12 V fans, so I used a buck converter to step down the 24 V from the PSU.