40mm RC motor heatsink (Large and Splits)

Acad file of a heat sink I designed for my Neu-Castle 2200KV 1/8 scale motor. It is yet to be machined. There are 2 versions. One that is meant to be a single large heat sink, and a mini version that is much thinner so that multiples can be used and spaced apart. I plan on cutting both to test which set up is more effective at dissapating heat. As of now my current CNC spindle is under powered for even this job. As soon as I upgrade the spindle and cut/test the heat sinks I will upload images/re