This is a sweet upgrade I did. Haven't tested the cooling capability, but it looks like it will work well
Here is a cooling kit that I purchased for just 9.99! 2 heat-sinks, thermal paste, double sided thermal tape, and a heat-sink with build in fan. It also has to quick attach pushpins.
I immediately whipped up a bracket to fit around the extrude motor and line up with the mounting holes. The holes needed slight reaming. The print as a hole looks beautiful and only required about 300mm of filament
End view of fan heat-sink to see how bracket was fitted. Underneath the copper I put down a full layer of kapton tape, this was to protect the motor from the thermal paste but still provide good conductivity. It also works as a vibration shield.
Here is a side view showing the quick push pin. Hopefully I will be doing some heat testing tomorrow!
The smaller additional heat-sink might be placed on the face thats showing in the picture if needed. If not both extras will be put to use on the other motors.
The extrude motor was still getting fairly hot so I added the small heat sink to the side with some of the double sided tape. Major improvement.