Homebrew PCBs

> Print to a file as postscript.
> 
> Bring it up in GIMP at your printer's native resolution.
> 
> Invert it, flip if needed, print.

Normally I find this options in the Printer-Options of at least any 
postscript printers. In my CAE-tools I can turn these options in the 
printer dialogue, too.

Martin