Yeah, it would be less restrictive, and I have now eliminated the middle plate, but some aspects of a middle plate are now built into the top plate, to save costs.
But as has been said before, restriction is not necessarily a bad thing, if it aids cooling. Just because a block is not restrictive doesn't mean its going to be a top performer.
And although you might be right about the pelt, I doubt it. The circles would only cover about 60% of the surface of the TEC, which is definatly not a good thing.
If you put a 45x45mm pelt on this block, you'd actually be able to see part of the peltier sticking out of the side of the block, not only not under the cooling section, but not even touching copper.
The design is easily adaptable though, just add more circles.
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