The blue circle radius is 18mm. The cuts surface length is about 15mm from center. The flat bottom is about 8mm radius, covering more or less the die area.
Longer cuts could have better performance, but would make the base weaker; as the fins support the base, like hang out beams from the perimeter. Also that means more working time, and this is very noisy. I think my neighbors start to hate me. :shrug:
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