This is just a no frills desiccant and hygrometer holder system for a cheep, makeshift filament dry box.

I found just using double sided tape and sticking two boxes plus the hygrometer holder to the underside of the lid worked like a charm.

Assembly:

The lids for the dry box slide in from one side (so when you place the boxes, make sure you orient the boxes so that you'll have room to slide in the top.) The lid has a little hump on one side, that should face the inside of the box and serve to help keep the lid closed.

Please refer to the reference pictures for the orientation and assembly of the hygrometer holder. One you click it in, you should be able to just slide the holder into the included rails.

Parts:

Here's the parts I used

Sterilite 20 Qt. Clear Gasket Storage Box, Blue Latches with Clear Lid
https://www.walmart.com/ip/Sterilite-20-Qt-Clear-Gasket-Storage-Box-Blue-Latches-with-Clear-Lid/39916455?from=/search

Veanic 4-pack Mini Hygrometer Thermometer
https://www.amazon.com/gp/product/B07FCPJRFH/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

wisedry 50 Gram [6PACKS] Rechargeable Silica Gel (I found that one bag per box worked great)
https://www.amazon.com/gp/product/B0781BN1BZ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1