Currently on Kbuntu 12.10 but I have had this problem with other distros.

I have an HP Deskjet F2120 printer with HPLIP installed.
I have drawn up a flange in freecad and I want to be able to print things like this out in 1:1 so I can confirm rough dimensions before going through the trouble to machine the part.
I have tried printing straight from freecad, converting it to PDF and printing it straight from HPLIP, converting it to SVG and printing it from the Gimp set at 100% size and I have tried about anything else I can think of.
HPLIP has an option to fit to page in the settings. This is deselected. I have done this exact same thing using Solidworks in windows as well as saving to PDF and printing 1:1. Why is this so hard to figure out in linux?