This Raspberry Pi case, is designed to allow the Pi to be both wall mounted and easily be portable in the same case. Further high print-ability was important. The bottom-/back- side of the main case component is largely hollow, to reduce warping.
The case has two rails on the back side, which fit into the rail negative on the wall-mount plate. With the wall plate mounted, the Raspberry Pi case can slide in and out of the wall mounted position, to become a portable case. (In case you need to access the pi, and do not want to unscrew the entire case.)
The top and bottom parts of the case join together with 4 M3 screws.
There are two versions of the case, one for Model B Rev 1 and one for Rev 2, the version is indicated in the filename.
On the top cover, there are mounting holes for a 50mm diameter fan. (the mounting holes are on the corners of a 40x40mm square).
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To direct the air inlet into a specific direction, you can use the RaspRail AirDuct: http://www.thingiverse.com/thing:399134
In case you don't want a fan just yet, there is a cover plate available:
http://www.thingiverse.com/thing:396885
