I'm glad to see someone is reading my babbling!
Ok, here's my design.
The first one is to be capped with a clear acrylic piece. It is a single channel straight through, with rows of square pyramids over the area of the core (actually they're offset, so that the water doesn't flow straight through between the rows).
An alternative would be to make a second top, where a center inlet would exit either side, but I'd like to see the channels shallower.
The second design is a 3/8 or 1/2 barb that fits inside a radial pattern of fins. The water exits the block through a 2 inch tube, which is attached to the 2 in barb that's mounted on the block. Of course the small tube is inside the big tube, and the flow is seperated through a special res.
I've got more details, but if either one of those catch your attention, let me know.
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