What should I do if my PCB does not require solder mask?

Unlike the copper layer, the solder mask layer is negative. This means a solid object in the layer corresponds to a hole, or opening in the solder mask layer (an area without solder mask covering). Therefore, for a board that requires the surface to be fully covered with solder mask, the solder mask layer should look like this, an empty outline of the boards. For boards that do not require solder mask at all (exposed traces and bare FR-4 substrate material), then the solder mask layer should be ...

solder mask design

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1 PCBWay Support 3
2 Engineer 1
3 Alessandro Sassi 1
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