This is a box with a Gasket that makes the box almost water tight. I printed the gasket out of TPU and scaled it 0.2mm. So that it can be squished a bit when the lid screwed on. I have left the gasket unscaled in the uploaded part so that you can adjust it based on your printer.
The threaded inserts are M3 8mm long and 5mm in diameter. The inside dimensions are 65mm x 105mm.
If anyone finds this useful and would like a box in a different size I let me know the inside dimensions you would like and I will upload new model.