EDIT: i started a new case project here: http://www.thingiverse.com/thing:874467
Here is my current case for the brand new RPi B+
The models are already repaired and oriented
What you see in the picture is printed using a 3DRAG 1.2
i just sketched and printed very fast beacause i had very little time so any comment/remix is welcome!
i printed at 5% infill, 0.2 layer height, support enabled (this makes port holes more precise)