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How do plated through holes/slots shows on the Gerber?

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Step 1. Put copper pads on top and bottom solder mask layers.
Step 2. Put milling slots in the mechanical/outline layer.

Plated holes/slots:
Circuit layer: holes have copper
Solder mask layer: holes have openings

Non-plated holes/slots:
Circuit layer: holes have no copper
Solder mask layer: openings don't matter


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