I designed and constructed the case with FreeCAD, and then 3D printed it on my cheapish printer. The most important figure of merit was that the device can be easily and quickly installed anywhere. This is achieved by a holder that can be either screwed or simply glued to the wall with tape. Onto this holder, the device is then clipped. 

The mechanical connection is provided by a 45° dovetail mount. This ensured that the push buttons on the bottom can be used with the device staying in place.

I am pretty amazed how well this worked with FreeCAD. As you can see in the animation, the real devices nicely works as expected from the FreeCAD rendering. 

Tinta Is Coming to Crowd Supply

I do have several ideas how to further improve the case, in particular by making it more modular. Tinta is heading for a campaign on Crowd Supply. The campaign will make it possible to buy a finished device in its case, ready to mount, instead of building one from the files here.

The firmware, the PCB, and the 3D-printable case are open under the Apache 2.0 license. 

If you would like to see Tinta become a real product, subscribing on the pre-launch page is the most useful thing you can do. 

Follow the Tinta campaign on Crowd Supply