I had quite a hard time finding thermally conductive epoxy adhesive. There is a lot of gel, paste and grease, but not adhesive. I eventually found and used Electrolube TBS (TBS Thermal Bonding System), so far no issues but I don’t think I’ll be able to remove my ESC from the cooling plate easily.
With thermal paste I would have to find a way to hold the ESC against the heat sink with some kind of mounting bracket, and I couldn’t think of a clever way of doing that. Thermal adhesive is probably a better option, but I was not sure if my heat sink setup would work well and I wanted to have the option to easily swap to something else if needed. The tape seemed to be a good option for that. I am using a modified heat sink I found in my random parts bin, I think it’s from an xbox 360.
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