Fits units that are 45-mm X 26-mm by 14-mm deep.
I acquired these combination Hygrometer / Thermometer from Amazon
Material, layer height, and fill are all flexible.
Support is recommended.
Set your overhang limit to 45° to not fill the box with support. I did get some stringing in the overhead of the print inside the cavity with the 0.35-mm layer height.
Printed one shown is Hatchbox black PETG at 0.35-mm layer height 50% fill.
The author marked this model as their own original creation.