Do you have any idea how hard it would be to taper that stuff? Never mind the size, it's basically a carbon fiber process, which can be as hard as steel.
Anyways, the heat transfer property would be proportional to the angle of the cut. If the cut was 45 deg, then (for example) the eGraf-400 stuff's thermal conductivity would be right in the middle between 370 and 6.5 W/mK, which would be 188.
I think that this stuff would be best used to transmit heat to a copper plate that sits higher than the normal fin area. It would basically allow a designer to have a much larger surface area, without impeding flow.
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