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Brian Leu made me realize that OSH Park updated it's design rules
and supports smaller features in a number of areas (e.g. 10 vs 13mil
minimum drill size). Details in their current design rule files and
support web pages and this <a moz-do-not-send="true"
href="http://triembed.org/doc/new-oshpark-design-rules.txt">simple
text diff</a> for Eagle. This might have happened long ago: I was
using a .dru from late 2016.<br>
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-Pete<br>
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