This repository is in the chain of Braille Trainer project
Braille tiles are educational cards with tactile Braille symbols to learn Braille alphabet. Characters are enlarged (three times larger than standard dimensions). In the back of each char there is a cutout in the shape of corresponding character in 'plain text'. Neighbouring tiles may be easily connected via small locks. On the left of each tile there is a separating threshold to help orientation.
Tiles are designed for 3D-print and need no supports/rafts, but Braille dots are made with standard 4.5mm bullets for air gun that should be glued in openings. Recommended layer height is <=0.1 mm. If you would like to just print-n-use, here in the repository you can find .sldprt SolidWorks source files and change revolved cuts to revolved extruded bodies (or write to me if you're unable to do this).
After designing these tiles I plan to make a system for Android that will use smartphone's camera to recognize Braille text and translate it to speech. Then it would be possible to make an educational application to study Braille with this cards and smartphone or tablet device.
You may also like to look at my other studies in accessibility:
github.com/braille-systems/braille-trainer - an interactive device for studying Braille alphabet
github.com/braille-systems/braille-display-cad - a mechanical refreshable Braille display