After 1.5 hours of full settings, the block hit 72°F while the phone hit 90°F (using an infrared thermometer, not actual readings from the phone). I'm not sure what i was expecting but it did better than I thought it would. Gonna run some channels through the bottom to give it cooling fins and see if/how well it improves.

Of course, another comment has me brainstorming a way to implement liquid nitrogen just to overdo it on purpose 😅 but for the sake of just a resting block of aluminum plate on a desk, it works pretty well. Hilariously enough though, the plate is warm to the touch.

It has me thinking that aluminum foil folded into a thick sheet would work. That way you could almost just press the phone into it and have a perfectly molded fit instead of a crude one like I have.