correct clamping pressure for a TEC is about 200 psi, I don't think the dd maze2 allows that much whithout breaking the block - the sttel (I'm assuming they're steel) screws would tear the threads out of the softer copper block.
I'm planning to clamp peltiers with steel bar and steel screws / nuts, should allow very high clamping pressures as steel is a lot harder than copper.
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