I was asked to make a 12 by 12 braille multiplication table. I started with roman_hegglin's model, rounded the corners on each square, added properly sized braille. 

3MF file has model split up for printing on smaller printers. Braille should be printed parallel to the print surface for a smooth finish. The 3MF has 3 square connector pieces, but I ended up gluing mine together without using these pieces.