Quoted from Lucxor:Thanks for that. I just was looking for fans on the Internet and found these parts for rc motors. Will order 4 and test if they fit arround the coil. If yes a very cheap and nice mod for only 6 dollars.
I will share all Infos if they really work. Would be great
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Already tested, they fit. I added thermal tape to the inside of the heatsink which makes sure that the heat sink doesn't fall off the coil and promotes more thermal conductivity between the coil and the heat sink. There's some blue thermal tape on Amazon that works great. These work best at 6.3 v.