An updated version of http://www.thingiverse.com/thing:714375
This case adds a second window for lights so it'll work for 2/B+ or 3. The back (bottom) has an opening for a heatsink if you have one on the RAM.
Use M2.5 x 12mm screws to secure the case together. The stand is a bit taller than the original from http://www.thingiverse.com/thing:333167. The case snaps into the stand and can be unclipped easily.