Filament Spool Desiccant Holder for vacuum-sealed bags

This desiccant holder fits along the perimeter of a filament spool, allowing it to be used in vacuum sealed bags. There are desiccant holders that fits in the center of a spool, but I'm not sure if that works well in vacuum-sealed bags where the spool's center aren't perforated and vacuum bags tend to wrap around the center's hole tightly.

The print has 3 pieces. The bigger cover is meant to fit in once without being taken out. The smaller cover to slide out for refill and changing refill.

Update:

There are some feedback that the original model is too fragile. I've updated to increase the thickness of the wall, and more vertical columns for support. 

Update: 

I have added a custom funnel that fits snugly to the opening of the holder here: https://makerworld.com/en/models/224360#profileId-242291