The trick to getting good braille output is to ensure that the "seam" produced when the extruder moves up a layer doesn't fall on the front face of the strip of braille. I tried messing around with skeinforge to solve this issue but I couldn't reliably fix the problem. My solution was just to add a ridge at the back that effectively displaced the seam.

I created these pieces using Inventor but other programs are definitely possible. I made a test piece in sketchup which worked pretty well.

As with my previous braille design, I extruded the braille font (easily downloaded online) from a flat face (80x10x2mm works well for one line of braille). I provided a .dxf file with all the dimensions I used. The size and spacing of the dots is particularly important in terms of the readability.
dots.physics.orst.edu/gs_layout.html provides some of the standard dimensions to consider when making braille.