yes, the top is just for more flow and making deeper holes in thicker copper would be better. but it'll be harder to make because the deeper you have to drill into copper, the more chance of the bit getting stuck. then how are you gonna make the channels with a dremel wheel in a block that deep? maybe you can try using a big cutting wheel, such as for an air compressor, but how will you get it to cut the channels all the way up to the walls (or anywhere near them for that matter)?
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