the classic #rotor block has holes in a rectangular grid like so:
the water can go directly from the inlet to one of the outlets in a straight line. what if the holes were drilled in the following pattern to force the water to hit every pole on the way:
someone brought it up in another discussion about the lemon block. is this worth implementing? to me it seems like an improvement since the water will absorb more heat in the process. the WB would be more restrictive, but with ~0.25" channel height it wont be a problem for a 300gph+ pump.