Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

My laser printer does the same thing. PCB (gEDA) has a place to put in
printer calibration numbers to compensate for this, because yes, it does
mess up large components (headers, DIPs). Note: when calibrating,
laminate the paper onto a PCB before measuring it, as the lamination
also changes the size slightly.

For other packages, I suppose you could print to postscript and use
ghostscript to turn that into a raster image, at a suitably calibrated
DPI setting.