SmartThings Motion Sensor (2015) case with AAA batteries

This is a 3D printed housing for the SmartThings Motion Sensor (2015) that takes 2 AAA batteries, instead of the single CR2450 button cell battery of the original case. The 2 AAA batteries combined should provide a significantly increased energy capacity of over 2000 mAh, compared to the ~600 mAh of the button cells, and for only a fraction of the price.

I was sick and tired of replacing the costly CR2450 batteries that these ST motion sensors use. The good brand ones cost around €1-2/each and last for about 6 months if you're lucky, while the cheap ones from Aliexpress can be had for as low as 30 cents/each, but they are typically crappy and die in a only few months. On the contrary, AAA alkaline batteries are much cheaper (eg. Ikea sells a pack of 10 for €1.79 with a capacity of 1100 mAh) and 2 of them wired in series provide the same voltage than a single CR2450 and more than 3x the capacity. So removing the need to buy button cells to keep these sensors running is clearly a win.