About the choice of heatsinks, they might not be the best heatsinks but they were about 1/6 of the price of the heatsinks that could condend. And when you need 10 of them price is an issue, I would not have started this project if the first thing I needed was to spend $500 on heatsinks. Same with the waterblocks and TECs. Even though the resulting pricetag did run away a bit, I think it would be hard to do it much cheaper. I will be on the lookout for cheap quiete fans. I think it would be smarter for me to cycle fans on and off and run TECs at low power. The idea of driving TECs harder when there is a load falls short when the thermal resistance is as high as it is without fans. So I will need fans to justify running TECs higher then 5V.

I am not completly satisfied with the way the Heatlane is clamped to the hotplate. The plate is to thin that clamps the heatlane to the hotplate. So the pressure on the heatlane is at the edges closest to the bolts. And not in the center. The pressure over the TECs is probably fine. Cant improve that without reworking the whole thing. Right now I have 2 M4 bolts and a very sturdy U-profile of 2mm stainless steel that secures the waterblock and TEC to the 4mm hotplate.