Buy all the components, print the braille wheels (with the 3D printer) and make the cut (with the laser cutter) for the box .

PS : the wheels models and the plan for the box are in the files.

Connect each stepper motors to a shield .

Connect every shield to the outputs of the Arduino card.

You need to power the shield (to power the motors) .

Fix the printed wheels on the stepper motors.

Put together one big side of the box to the side with the long hole (where you'll can touch the dots)

Stick the motors on the biggest side, the wheels have to be not far from the edge of the box (to have dots a little outside the hole) .

Don't mix the stepper motors (the order counts)

Put each shield and the arduino on a layer of polystyrene because you won't be able to stick the shield and card directly on the medium.

Stick the shield on a side of the box, in a way that the alimentation cable will be long enough .

Assemble the side which is at the opposite of the one with the long hole.