Well in order to have pins that stick out of the baseplate you need a thick chunk of copper. You cant just solder the pins on or something, that would degrade the performance extremely.
The #rotor design is the easiest since you just drill holes and then use a dremel or something to make channels between those holes, that way you get a lot of channels around a large amounts of pins.
Remember, you want alot of copper surface that can touch the water, you can try make a rotor out of that 3mm copper plate, but the pins will be extremely small. You will get a block where the water runs above the pins, which might work for a low effect peltier, i dunno, but the real #rotor design is made so that the water is forced to run between the pins since the top of the block covers the top of the pins. If you try something like that on a 3mm baseplate your block will be HEAVILY restrictive since the channels will only be like 1,5mm high.
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