This a simple case for the BM31 moisture measure instrument. I wanted to have one without buying any of the expensive ones. It fits the device perfectly. It's possible to add some small rubber pads to the inside so that it lays on a softer material than PLA, but it's not a requirement.
No supports are needed. For sturdy print I recommend min. 3 walls. A gyroid infill of 15% should do.
Color change layer can be used to have the letters and the base/lid more pronounced.
The provided gcode file does pause for a filament color change.
After the print, a 1.75mm filament (PETG recommended) or a thin wire can be used to connect the hinges between the two parts.
The author hasn't provided the model origin yet.