@icedquinn Oh I didnt even buy the CNC yet... still shopping. Sooooo many options. It is a big purchase so im trying not to rush it.

@freemo the part design still has to happen tho even without the machine in hand.

@icedquinn indeed it does. But I have prototype steps to figure out first. Been struggling decide how I want to heatsink out the hot side, which will be a rather large surface overall. Im not sure if the space is too tight to just throw a air heatsink on and call it a day. I'm debating making it modular and using liqduid cooling for all sections and then air cool the liquid

@freemo liquid cooling loops with air radiators work for computers. is your work load hotter than 90-100C?

@icedquinn well if it were just a matter of being a cooling system id have no need to stack the peltiers, they could run in parallel and would be a pretty simple deisgn.

For me its not about cooling a hot surface down to room temperature or slightly below but rather reaching cryogenic temperatures, for that you need to stack peltiers and run them in a combination of series and parallel for it to work.