Cannot get copper cast with the channels this deep and fine. Already investigated that path. Casting typically requires about 3mm of clearance between large deflections, which is why Swiftech may be able to get theirs cast.
As for the silver bases, people are just happy to have silver and don't necessarily want to go TEC. It's not something based in practicality, but if people are asking me for it, and it's doable, and they pay me, then I'll provide.
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