Silica desiccant box for a filament spool

This is a desiccant box design I use when storing my spools in vacuum bags. Each spool is stored in its own bag together with the box. This design has adjustable clip contacts so it fits most of the spools OK.

You need humidity/temperature LCD module to seal the box and keep tracking the condition of your stored filaments. The module is low cost, less than 1.5 dollar and they sell them both in Amazon.com and Aliexpress. Just search for humidity temperature LCD and you'll find one. Make sure y