All of the ducting near me is a bit too slim to fit sensors based on this, so I decided to design and print a case instead.
Does the trick nicely, and I also chose to use proper AA battery clips to retain a good connection, as the cable-tie battery assembly wasn't holding well for me!
On the Thingiverse page I have a link to the original OnShape doc.
https://www.thingiverse.com/thing:2418194
Thoughts, suggestions, etc will be much appreciated!