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My first build on the 450D should come in at under 1 kg. But I'm only using a small alum heatsink plus fan to start with. When I go copper finger I will up the heatsink capacity but still reckon I won't be much over 1 kg all up. I'll do some weight measurements when it's closer to completion.
I'm also thinking about the argon idea but wonder if the result justifies the effort if temps just above zero do the job.
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