There is the punnet paper printable case, but it's for the old version of the Raspberry Pi. I have a Raspberry Pi 2, does a similar printable case template exist some place for this model?
I was only able to find this on Google. It should work for the RPi 2. It's in a PDF form instead of a nice SVG, but it looks like it could fit what you need.
I made a printbable case for the Rapsberry Pi 3 Model B, if you are interested in this one. It can be downloaded at the Embedded Linux Wiki here. There are also cases for other models if you are not already using the RPi 3.