HyperFlow Fans Comp V2 4s High Speed RC Cooling fan for the Traxxas 3S line 36mm / 540 Shroud 3D printed shroud slides over the top of the motor and is secured with two large zip ties. I use a modular connector system based on the JST 2-pin connector. This makes it easy to swap between whatever connector you need. This includes a 3S adapter. Comp V2 30k rpm 6-16v 2a
eBay