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I can never remember. How should the mask layer be formatted? I hope I can describe this clearly:
As a “negative” mask where I put little circles where I don’t want mask?
As a positive mask, formatted like a copper mask where I have an entity everywhere I want mask and leave the openings blank? i.e., have a large rectangle the size of the board and create holes where I want the openings to be.
Positive is anything drawn on that layer represents material example: copper, solder paste and ink
Negative is anything drawn on that layer represents absence of material example: opening in solder mask.