Braille!
thingiverse
The MakerBot has shown promising results with braille printing, though I, as a non-braille reader, can't vouch for its readability. The key lies in perfecting the G-code to avoid defects on the front face. This project has piqued my interest; next up is designing and 3D printing a braille bracelet. For optimal resolution, I printed the braille in a vertical orientation, but it might be worth experimenting with a flat layout as well. The design was sourced from http://www.softpedia.com/get/Others/Font-Utils/Braille-3D.shtml.
With this file you will be able to print Braille! with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Braille!.