Here's a video explaining the design:
The 3MF is in 2 parts, I recommend putting them with their flat ends down on the bed and about 20% infill on an FDM.
It really is very small: 113mm x 39mm x 19mm.
I've made 3 of these, there was a couple of minutes of sanding needed to tweek the tolerances of the snap fit on the lid, but it is really close enough.
If you have any issues or questions, please message me, I am happy to update and re-issue the 3MF.
Originally modelled in Solidworks in April 2022 it took about 7 hours. A few more details about the process of designing this are on my website.
The author marked this model as their own original creation.