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From: "Erich Heinzle (a1039181 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date: Fri, 13 Jan 2017 22:29:53 +1030
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Subject: Re: [geda-user] thru hole slots in PCB
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Precedence: bulk

I haven't used it, but this is something my usual PCB supplier,
hackvana, coded up to allow gerbers from Eagle to have slots inserted
between holes with with same "magic" drill size specified.

https://github.com/hackvana/eagle-plated-slots/


There isn't much to it, it parses the gerber file, finds the pair of
holes, and replaces them with a G85 slot directive.

More recent versions of gerbv will render G85 slots properly.

YMMV, but I'm sure the author would be happy to field any queries over
on freenode


Regards,

Erich.