Robo3D Bowden Cold End Active Cooling Motor Bracket
A motor bracket/ductwork designed around this particular NEMA17 5:1 geared stepper http://www.omc-stepperonline.com/gear-51-planetary-gearbox-for-nema-17-geared-stepper-motor-p-40.html . A 40mm fan mounts beneath it. It's also meant to mount to the factory spool holder.