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Date: Wed, 2 Apr 2014 13:26:34 -0400
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From: DJ Delorie <dj AT delorie DOT com>
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In-reply-to: <20140402112140.5df5a754@richard-laptop> (message from Richard
	Bown on Wed, 2 Apr 2014 11:21:40 +0100)
Subject: Re: [geda-user] printing from PCB
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If you're doing UV photoetching, here's what I suggest:

Export your layers as PNGs at whatever your printer's maximum square
physical resolution is.  Postscript leaves too much to the interpreter
(for example, ghostscript and HP give different results), the PNG
exporter has been hand-tweaked to give exact coverage for just this
purpose.  This step can be automated via makefiles or scripts.

Figure out how to control your printer better than your printer
driver.  I wrote my own software for the Epson series so that I could
control drop size and placement myself, to get clean edges without
smearing.

Print on Jetstar Premium UV film with the highest ink density your
printer can handle.  I've tried a lot of films and none do it right
except this one.

Get a Stouffer 21-step transmission wedge and calibrate your exposure.
Most films require a hold at 8.