This script creates G-code that can 'print' braille on every surface. Go to http://lemio.nl/braille , there you can tweak with the settings (size, speed, fillament, temperature, retraction distance etc...) The default settings are tested on an ultimaker. Download the g-code file, and put it on an SD card (or print using printer software (repetier, pronterface...) The source code can be found on Github: https://github.com/lemio/braille-gcode