First of all, a MASSIVE thank you for a thoughtful and well implemented plug-in. The output is almost perfect.
The issue I am having is that events (from "the events calendar" plugin: http://wordpress.org/extend/plugins/the-events-calendar/) are not being stripped of their styles correctly. The preview of the printed output includes the page almost exactly as normal (background images, navigation, other images all visible).
I imagine this is a theme issue of some kind...?