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I thought about using thermal paste as well but was concerned with the dirt and dust and gunk that gets into everything when you run it outdoors.
And youd need to put a separate sink on each motor you used most likely, as removing the sink each time would waste the goop and make the risk of getting it elsewhere as well as getting dust in it higher.
Might be interesting to test the life of the motors w and w/o heat sink to see how long they last.
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