Looks very nice. Should perform well, even with peltiers.
I gotta say it though, that's a heck of a lot a machine time to make something like that. At a rough estimate, we'd be looking at something approaching two hours just to mill that out if they are 1mm wide channels. If 1.5mm (or 1/16") wide you should be able to get it down to around 1 hour.
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