NOTE: This case is a tight fit. It's identical to the original with the addition of the camera cable slot. If you don't have your printer calibrated your pi may not fit. Slic3r and Simplify3D have an XY compensation setting you can use to calibrate your printer's XY size accuracy.
There was already a remix of this case with the camera slot but it wasn't a remix of the case with the vented back, so I remixed the fully vented case.
I've included the original end cap for convenience. This is a great case which required next to no finishing (if you have your printer calibrated). I've included my Simplify3D supports file for the case.
PLA, sliced with Simplify3D, 2 perimeters, 3 top/bottom solid layers, 20% infill, supports as shown in the pic. The cap was printed with 2 perimeter and solid infill.