Before printing the file, make sure you go into settings of the Pep viewer and state you are using letter sized paper. I think it defaults to A4. Also, make sure you have the correct scale of the pep before trying to create a final product. Helagak's helm opens at something like 234 scale, but (for instance) the 220 scale fits my head. If you do not buy the Pep viewer you cannot save anything you change, so when I find the correct scale I, for example, renamed the helmet fileStarlordHelm220 to ID the scale