The same is true for almost every CAD system (even far more expensive ones, as well as open source alternatives) - they simply don't help you out much when it comes to getting the PCBs made. Part of the reason is may be that EAGLE doesn't really enforce rules to keep the "right" kind of objects on the "right" layer. *) to add helpful information, but doesn't. It could also be using gerber comments (G04. EAGLE *could* be tagging the gerbers with layer names (%LN.*% in gerber parlance) to communicate intended use, but it doesn't. not combined into some other format) gerber files from a naive CAD system like EAGLE. There isn't a great answer to this as long as you're using "naked" (i.e. ![]() From a software developer's (and many users) point of view, all gerber files should have the same extension so they can be mapped to programs, mime-types, etc. From a manufacturer's point of view, having different extension names is useful since it helps them automatically identify the purpose of each file (top silk, top copper, etc.). No, EAGLE doesn't enforce a naming policy on gerber output (though defaults are there).
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