This is not my idea, I saw it at polychemy. However, I thought it was a shame not to actually have your own fingerprint on the case.
People have already suggested it’s possibly not wise to broadcast your fingerprint. It’s my understanding that a system relying on an image of a fingerprint based security is already broken.
This is not a finished product, it’s a proof of concept. Some work is required before you could actually print this for your model of phone. Someone please fork the repo and add some real cases!
Get all the files and instructions from here: github.com/mattvenn/fingerprintcase