Wanhao D6 stepper cooling duct

thingiverse

To boost the motherboard's cooling, use one or two 5015mm centrifugal fans. Attach them off-center with M3 brass spacers or long M3 bolts. Additionally, power a second fan from the mainboard using an available socket. This setup effectively cools the steppers from 45-50C to under 30C, as monitored by an Arduino. This temperature drop is crucial because the steppers tend to malfunction at 50C.