This is a very simple but effective box for holding your reusable desiccant pearls. I use these inside the airtight containers in which I store my filament. A single default-sized box will hold enough pearls to keep a box of 4 filament rolls around 10-15% humidity for weeks. Especially when using airtight boxes.

I optimized this model to get a balance between material use and getting a decent-sized box that's not too flexible. Other models sometimes also have holes on the bottom and the side of the boxes. In my opinion this will complicate the printing process and won't offer any real benefit.

This model does not need supports. The rail in which the lid slides to may end up with some imperfections but it will be fully functional and won't need manual clean-up which should be good enough for a desiccant box. Re-orienting the model and adding supports might clean things up, but I did not try that since I do not need my desiccant boxes to be perfect. I print these using PETG, PLA will probably print cleaner.