So as written above, I'm thinking of putting some fins into the design. See the pic below. The red lines should be 1mm high, the blue lines 1mm deep so between the red and the blue line there will be a difference of 2mm height.
Milling time is not a big problem because the CNC will do this over night.....
Would these fins be contraproductive, or will the increase performance?
Edit: sorry, i forgot the blue lines in the lower right part
