Compact case for Aranet 4 CO2 monitor

thingiverse

The 3D printable case provided by the manufacturer is nice, but very large. I designed one that is just large enough to fit the Aranet sensor. One version of the lid has a window so you can see the data in real time, the other is solid. The case is held together with four M3 hex bolts. There are no nuts, the holes in the back are threaded and this works well. Because of this, and as the fit of the Aranet 4 into the case is designed to be snug, it is a good idea to ensure your printer is well calibrated. I would suggest running a calibration test first and adjusting horizontal expansion accordingly. The test piece at https://www.thingiverse.com/thing:4766295 works well, although I put a more detailed explanation of the concept on an older version at https://www.thingiverse.com/thing:3535060.