Archive of the former Yahoo!Groups mailing list: Homebrew PCBs
Subject: Re: [Homebrew_PCBs] mac osx and laser jet 1102w for toner transfer - problems
From: DJ Delorie <dj@...>
Date: 2011-12-24
Keep in mind, the average laser printer (including yours) is 600 DPI -
that's 1.33 mils PER PIXEL. An 0.5mm pitch part has pads on the order
of only six pixels, so "off by one" is a 16% difference.
Som postscript printers "fill" a region by drawing both the outline and
the fill. That tends to produce features that are one pixel larger than
you expect. gEDA's PCB has a setting to compensate for this if needed,
or you can use some other program to convert the output to a 600 DPI
bitmap, preview it, adjust if needed, and print the bitmap.