Desiccant Dryer in a spool shape and size in order to dry loose desiccant in an active dry box. In my case I am using the Sunlu S4. It also doubles as a desiccant holder to maintain low humidity when the dry box is not running.

The big concern was I didn't want to dry the blue to pink color change desiccant in anything that we put food in. So if that's a concern for you or if you just need a way to dry desiccant and keep your filament dry, then this is for you.

This can be printed in your filament of choice, however, it should be with a filament that can handle the same temps as what your drying in that box (PLA dryer with PLA or similar, PC dryer with PC or lesser temp materials). I have one in PLA that I keep with my PLA and one in PC that I keep with all other materials

Desiccant has dried in my setup in 6-8 hours at 70C (PC dryer) and 10-12 at 50C (PLA dryer).

Side pops on to the main body with minimal pressure, and the screw lid threads are big enough with enough tolerance to accommodate the messiness caused by printing it parallel to the bed with supports.