SmartThings Multipurpose Sensor (2015 & 2016) case with AAA batteries

thingiverse

After designing the SmartThings multipurpose sensor 2015 and 2016 models and successfully operating all my motion sensors with AAA batteries, it only made sense to do the same with the SmartThings multipurpose sensors, of which I have a larger number. Although these sensors have significantly better battery life than their movement detection counterparts, it still sucks to buy CR2450 cells and replace them every 6-8 months (in my experience). So, this is a 3D printed housing for the SmartThings Multipurpose Sensor 2015 and 2016 models that takes 2 AAA batteries instead of the single CR2450 button cell battery of the original housing. 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. Unlike with my previous project, in this case it wasn't possible to reuse the original base part with the 3D printed case, so you'll need to print at least 2 pieces: the case itself and a lid. Optionally, you may want to print also the base piece to fix the sensor to the door/wall, though the grip on the case is not great and I ended up using self-adhesive velcro tape to do the same function.