MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
The inside width (where your head goes, at the temple) is ~160 mm. The height is ~215 mm. You should be able to calculate the percentage based on that. The height is not as important as the width because there is nothing under your jaw. I just included it for reference.