How do I account for the area of the holewalls when I am pattern plating?
When determining the area that you are pattern plating, only use the area that is exposed on the SURFACE of the board (e.g. traces and pads). This is a very good first order approximation since the contribution of the walls of the through-holes to the total surface area is somewhat masked by “electrostatic” effects at the rim of each hole.
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