Library Lyna is a repository collection of high quality educational 3D models to help teaching of the blind and visually impaired.
Great project!
Here is a Library Lyna homepage with MANY models which can be 3d printed and used in classroom:
http://www.librarylyna.com/
Here is the image of the site with geometric shapes with Braille titles:
If you want help someone who needs Braille signs, here is text-to-Braille 3d model generator:
http://diy3dprinting.blogspot.com/2013/11/text2braille-website-generates-3d.html