Bookmark holder - Bookmark display stand

A display stand or bookshelf holder for bookmarks up to 2 inches wide.
I created this for my fiancé to use at weekend expo's where she vends handcrafted bookmarks.
It'll hold at least two dozen bookmarks. The ridges at the bottom keep them upright even if there's only one or two stored.

I've uploaded pictures of the hollow-back version that she preferred. There's an .stl for the hollow back version and one for the closed-back version.
No supports needed for either design.