I've tried thermally conductive epoxy and potted the stators but it did more heat retention than dissipation. Those windings won't move and possibly short at least. I forget the numbers of the resin I used but finding a really good one, which I think some of the silicones can be, is expensive.
I've also had a couple different versions of "fan" made that sit on the side of the motor that I tried. The best designs were somewhat effective but I skipped the little tricks and just am making bigger motors now that match the abec11 centrax 83x78. More room for more motor and a bit more rubber too. And a new 12mm axle hanger.
Im building the motors now and theyll have all pressed bearings, and all motor leads fat, potted, and facing up and 52mm stator instead of the old 25mm
I've been spending hours looking for the strongest steel that's still magnetically soft because it's right beside the motor now. Iron losses due to a magnetic field producing eddy cutters seems to be pretty unavoidable as all metals are pretty electrically conductive, but magnetic metals, unless they can flip polarity very fast, and are magnetically soft, like electrical steel or better iron, while create a magnetic hysterisis and be more inefficient. Settled on 4130 steel. The non-magnetic 300 stainless series are pretty weak unless cold rolled and might be able to get those. All speculation and I've found it impossible to find a good simulation showing what will happen with these new motors and their tighter gap between winding endturns and metal
Here's with a plate throwing air out radially on the other side