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Date:	Mon, 30 Jun 2014 09:39:27 -0400
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Subject:	Re: [geda-user] pcb: Patch for arcs with different radii for x and y
	on screen
From:	Bob Paddock <graceindustries AT gmail DOT com>
To:	geda-user AT delorie DOT com
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> Real-world blind and buried vias always connect a range of layers from N
> to M.  The tricky bit in my experience in large-layer-count boards was
> always when there were multiple buried vias with the same X-Y
> coordinate.  In other words, something like layers 2-3 and 6-7 connected
> in an 8-layer board.

From a discussion I had with my board house years ago:

"Per our discussion, here are hypothetical examples of pricing:

4 layer board, no blind or buried vias, price = X.
4 layer board, single blind vias (layers 1-2 or 3-4), price = X + 1/2-2/3X.
4 layer boars, single buried vias (layers 2-3), price = X + X.
4 layer board, double blind vias (layers 1-2 and 3-4) price X + X + 1/2X

If blind vias overlap layers (say 1-3 and 3-4), we would have to no
bid at this time, as laser (controlled depth) drilling would be
required, and we do not have this process currently available."

- Raw text -