Hello!
Theoretically (since I´ve drilled any WB:s) it looks as if the incoming waterflow up from the pinpattern is blocking the way for the incoming water.
If the pinpattern, as Jaydee116 states, continued over to the WB outlet You would get a better waterflow through the block, and (hopefully) lower temps.
The design in itself looks promising.
BTW: How wide are the channels You´ve cut between the holes? How did You cut them?
I´m a bit fascinated by large, metalcutting devices, and want to justify a purchase of one by drilling WB:s.
regards
Mikael S.
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