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7 Files Need to be Passed to Fab House

Anytime you transmit a PCB layout to a fab house, you need to pass them 7 files, and 7 files only:

Top Copper (GTL)

Top Soldermask (GTS)

Top Silkscreen (GTO)

Bottom Copper (GBL)

Bottom Soldermask (GBS)

Bottom Silkscreen (GBO)

Drill File (2:4 leading - remember this)

What is this GTL, GTS? These are the file extensions that the CAM processor will produce. A silkscreen is also called an 'overlay' (hence, GTO). And for your reference, a soldermask is also called a solder 'stop layer' because the soldermask prevents solder from being where it is not wanted.