Simple case for the Raspberry Pi 3 Model B
As usual I've attached the Fusion 360 file to make adjustments easier for you. You will also find a factory file with the settings from my Prusa MKS2 and ASA from rigid ink.
Update 2017/09/07: Adjusted the size of the cut outs by about 2mm and added different variations of the top part (full cut out logo, half cut out logo, no logo). I'm not sure about the "no logo" version, unless it might have not enough ventilation. But @PDBeal ask for it, so I've added it.
Side note: I'm new to 3D printing and CAD and so I've to learn everything. I believe that making things on your own from the very first step is harder but finally you will get things done. Because of that I try not to download lot of things but create them from scratch. Even if they already exists. By sharing those things I hope to get feedback that I can improve my skills. So don't be angry if I upload things which already exists here.
I've printed the case with Rigid ink PLA and ASA. Both worked fine with for this case