This is another iteration of the Coffee Cooler ( a.k.a. Pointless Machine ) this time there is logic to it !
It utilizes the thermostat module w1209 which activates cooling when the temperature of the mug is above certain point (specified by the user ). it also can stop when you specify, so wont cool it too much.
It is far superior than the previous one, it cools coffee around two minutes faster than its predecessor.
Housing of the thermostat is here : https://www.thingiverse.com/thing:2991220
what you need :
w1209 temperature module with thermistor
12v 1a (minimum) PSU
1 x m5x50mm + m5 nut
8 x m3x10
6 x m3 nut
2x m3 nylock nut
on/off switch (https://www.mcmaster.com/7395k28)
I suggest using silent fan ( i am using https://www.silentiumpc.com/en/product/zephyr-120-pwm/ and works great you cannot hear when it works ).