Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3586118.
So this is probably another one of my fringe case, one off type designs, but there it is...
I have this little brass caliper that I found in my tool drawer. To keep it from getting damaged, I decided that it needed a case. Unless you have this exact caliper (and you know who you are!), you probably don't need this as it is, but the tray could easily be modified to fit what ever object you'd like to use it for.
This is designed so that the tray snaps into place once inserted into the case via two small bumps at the bottom. It takes a little bit of force to push it in and to pull it back out, but once it's in, it's not going to just slide out. I added a finger hole through the tray so that you can easily push the caliper out.
NOTE Due to either a Thingiverse bug or (more likely) shadowbanning, my models no longer show up under the [Newest] listings. If you want to see more of my models, please be sure to 'follow' me. If you print this, it would really help if you'd post a 'make' so that others could find this model.