My PCB manufacturer requires me to provide them with a separate file for the PCB outline. He knows that the PCB outline can be included in one or more layers of the CADCAM fabrication file, but he prefers to have a dedicated (text) file to avoid confusion during data preparation.
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Dear Remy
It's better you build a single outline layer, as below information shows, then there is no any confusion for our engineer and we can handle your orders faster, tks a lot!
Proteus_V8-15_JLCPCB_Board_edge-outline.png (57.88 KiB) Viewed 368 times
When I am asked for this, I copy the board outline to a mechanical layer, and output that as a gerber file. I omit adding board outline to any of the other layers.