I started out just wanting a book model that I could print out in two colors so that the pages could be white (or gold for a Bible:) and it turned into this. Why settle for a simple book, when the book could hide something inside?
The pages slide out of the cover and slide back in with a nice snap to keep it closed. You gently pull the cover back a little to disengage the tab.
At it's default size, you can stack two SD cards inside one book. It also works well for stashing a few Tylenol or emergency candy. (SPREE!)
A [Tiny Bookcase](https://www.thingiverse.com/thing:2818967) is now also available to store the books.
Updated 03.01.2018: I replaced the BookPages.stl after discovering a very tiny error with the top not being perfectly level. The one available now should be good to go.