Wanted to share in case someone else was experiencing this...
Environment:
SketchUp 7 (7.1.6859)
Mac OSX Snow Leopard
Problem:
Despite following the directions explicitly... could not manage to print a true 1:1 scale.
Ex: I drew a 100mm x 20mm rectangle... Printed at 1:1 scale... Measured... longer side was at 104mm. Went through this over and over again. Read and re-read the directions...forum postings, everything...Nothing helped.
Solution:
In the File->Page Setup (Remember this on a mac...may be different for PC) I HAD 'Format For' set to 'Canon MP620 Printer' and 'Paper Size' set to 'US Letter (borderless)'... Sounds reasonable right? Well guess not, because as a last ditch effort I decided set 'Format For' to 'Any Printer' and 'Paper Size' to a custom '8.5 x 11 Borderless' that I made via the 'Manage Custom Sizes' option in that same menu and BAM problem fixed!
If I set 'Format For' back to 'Canon MP620 Printer' and the 'Paper Size' back to 'US Letter (borderless)' problem returns again! So, I'm not sure what the scoop is but obviously something screwy with the Canon supplied profile.
So moral of the story? It's definitely worth giving this fix a try if nothing else is working... definitely did it for me.
-Mike