system
December 4, 2024, 7:58am
8
The question comes up often and this thread is found by a relevant web search. Therefore, here’s an article with more information about solder mask, including the DRC error:
Solder mask is physical substance applied to the physical board. There are holes in this mask which expose copper pads.
[image]
Illustration: pads and solder mask openings.
In KiCad (and other EDA) the graphical layer which represents solder mask is negative. Where there is graphics in this layer, the physical solder mask isn’t applied and there will be a hole in the solder mask.