It's not actually "kissing away 2 mils"

When you start adding up tolerances for drill hole size, location, layer registration, process allowance.... you can easily come up with 2 mils difference from one shop to another.  10 mils hole to copper shouldn't be difficult at all for a good fab shop.

Not that it's really possible, but any shop so particular with their drilling that they wouldn't require some sort of desmear would be particular enough to desmear anyway.

Pete

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