When making Tumaker's Rubik's Braille, I found the small sphere no easy to print. You need to add raft for them to be adhesive to the printing plate. So I put those sphere's on the cubes to make printing easier and save the glueing work.

I also found that braille dots placed on the sides of the cubes do not produce harsh points when printing, as those placed on the tops do. Dots can be painted with markers afterwards.