Looking at my collection of Game Boy Colors and the lack of a case covering my precious Raspberry Pi B+, I came to the conclusion that it has become necessary to combine two of my favorite things--games and pies.
This case is simple and accounts for all of the B+'s ports (with the exception of the GPIO, which would ruin the aesthetics of the shell). The case is designed to look similar to a Game Boy Color. No parts require support, so print everything as oriented for maximum deliciousness.
I printed in .14, but it really doesn't matter.
Print everything as oriented in the STL files.
Make sure your printer is pretty well tuned, as I designed the case with .2mm tolerances in mind.
Use tape or glue or whatever to stick the buttons in place. Put screws that fit in the holes.