Originally Posted by
drcrash
I sorta guessed as much. I'm toying with some related ideas, though, that might likewise not be worth the trouble.
I'm wondering if it would be worth embedding some thin aluminum rod in an aluminum-filled epoxy mold, rather than tubing, just to provide long paths of solid aluminum for heat to travel through, or maybe putting strips of windowscreen in the layup.
Two applications of that are for a small rotomolder, and for a vacuum forming mold (& a plug-assist plug) for rigid sheet foams like Depron (an extruded polystyrene). Vacuum forming that stuff seems to be pretty tricky, and to depend on very even heating in a narrow range of temperatures. Molds and plugs that even out the heat well might be useful.
(Then again, maybe aluminum-filled epoxy is already plenty conductive enough that if you preheat the mold properly, the problem is solved.)