This is yet another desiccant case, it is designed to follow the curve of a standard 200mm spool so it can fit in the edge of a smaller dry box.
The case is sized 6x6x15 cm to exactly fit the box I use and hold 100g of desiccant (photo shows proof ;)).
Print it standing upright, default settings should be fine. I print these in ASA so I can dry the desiccant in the box itself. It uses a simple snap-on lid system that I've found to be really reliable.
01-05-2024: I've added a bottom frame that you should be able to glue inside your box to hold the boxes in place while moving them. I've not printed it myself though, but I've purposely used quite a big tolerance. I've also added a step file version (besides the existying f3d_, so anyone can easily edit it.