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Originally Posted by lolito_fr
Hmmm, well after sifting through those posts I'm not sure I'm all that excited any more  Casting copper looks tricky, to say the least.
Is this a waterblock or a phasechange block 
If it's for phase change then won't the microscopic air bubbles pose problems, regarding refrigerant leakage, etc? |
Phase change. But, the voids probably wouldn't leak unless there were a LOT of them. Good question, though. Milling is definitely the way to go, IMO.