These tiles are used to learn the alphabet in Braille. They were requested by Lore Schindler, a teacher of the visually impaired, in the 3D printed education models group: https://groups.google.com/forum/#!forum/3dp\_edu\_models. The tiles are designed in OpenSCAD, and have parameters that you can modify (for instance, to change the font size of the letters, or to adjust the margin to make a larger or smaller tile). They use my Braille Openscad library, which you can find on github: https://github.com/whosawhatsis/braille-openscad. It is not recommended to scale the STL, because there are specific dimensions used for Braille, and it will be difficult to read if it's not the right size.