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You can't just do a DRC on the Gerbers alone. Your PCB design may
have several design rules which the Gerbers don't have information about,
like clearance between nets or trace width for high current nets.
I always run the "DRC" in my PCB software before generating Gerbers.
The netlist information that is helpful for finding the kinds of common
errors that DRC is supposed to catch is simply unavailable in any of
the Gerber files.
I don't run any sort of check on the Gerbers, other than printing out
the Gerbers at 1:1 and briefly glancing at it while dropping a few
physical components on it.
Review your gerbers after you confirm your design in CAD.
Use a free gerber viewer to grab pictures to include with the order
so the board shop knows what you saw.
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