Well, it had to be done. This is the enclosed version of the Simple Raspberry Pi bumper (versions 2&3 B iirc) found here: https://www.thingiverse.com/thing:3401335 If you're not into hiding the electronics, go have a look there now.

As with the simple bumper there is a bare-bones version, a version for use with the raspi cam, a version that will allow access to the pins, and a cam/pin version. Just print the bottom and the top you like and snap together.

Pro-tip, when/if disassembling this, use a spudger and remove the bottom - the mating pins are less likely to break that way.

Also caveat: the free-pin version seems to snag about half a millimeter around the pins (doesn't affect usability) - I'll look into it when I have the time.