Airtight Filament Storage W. Desiccant 4 Reels

My prefered filament storage solution is the Lock'n'Lock HPL889 12L box, which perfectly fits 4 Bambu Spools, with very little spare room.  With a reliable and long lasting air tight seal.

Here I've created a simple desiccant holder which neatly fits into the bottom of the box, each of the 4 parts contains approximately 150ml of desiccant beads (larger than 2mm is essential, ideally 4mm) which I find lasts 6-12 months in the fairly damp climate in which I live.

The design is the result of a number of iterations, tweaking the design to fine tune the structure to remove the need for any support structures, maximize the area for gas exchange and desiccant volume, and ensure a robust structure suitable for years of use.

Included in the build is a funnel, which will screw into the fill opening to ease the filling process, and can be replaced with the cap once leveled.

Personally, I've bought the Lock'n'Lock HPL889 12L, from Amazon, and various local Kitchenware suppliers, 

I've realised some of the photos are of an older version, with side located fillers, not the current hidden (when installed) end located ones (bottom box of the stack).   The single ¼ unit is the final and included version as uploaded.

I'd also note, that for some reason, despite the thread CAD model being identical, the threads for the individual handed parts appear to print in such a way that they are easier to thread with the correct cap, and so one cap is marked with a small hole, with the matching body having a matching hole next to the filling port.