Fits 1 (one) Raspberry Pi in a compatible mount Brick. This mount is intended to a hold Raspberry Pi Model B Revision 2.0
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The case itself can be stand alone or mounted. The (4) "+" mount holes also fit the Lego + shafts in technic kits.
This base plate is also compatible with Adafruit's Low-profile microSD card adapter for Raspberry Pi. Just clip out the support peg for the normal SD card. The picture above shows the case base with the RasPi and that adapter. Its much better then having a big SD card sticking out.
If you don't have a 3D printer but you're interested in getting one of these we can print you one at badbrick.com/catalog
In MakerWare, I modify the "Medium" settings:
Quality: Layer Height = 0.2 and I increase the temp to 240C to let the little larger prints fuse better.
All other defaults are the same.