This design features

1. Air-tight filament dry box based on a off-the-shelf cereal box / storage container
2. Storage for silicat gel
3. Control with hygrometer
4. Direct feed as external spool
5. Label the filament boxes with material & printing temperatures (Pen & labels comes with the boxes)
6. Target cost around 10€/filament box

Description

I wanted to come up with a cheap solution (cost see below) for drying and storing used filament spools and to be able to use them as external spools.

Furthermore I wanted to keep track on the drystage to be able to switch the silica gel on time.

The idea is to not modify the box at all, to be able to reuse them if needed in future (no drilling or glue).
The original lid can be just popped out and replaced with the printed part.

Used parts with links and costs

Printing

I used cheap Sunlu Antistring PLA with the Bambu generic PLA print profile with 0,2 layer height, 2 wall, no support and 15% infill.

The whole lid/cover & rollers set for one filament box prints in 2h 20min and uses 70,7g (PLA)

Two set fit on a 256mm buildplate and prints in 4h 08min.

The lid/cover only prints in 26min and uses 9,66g.

I also added the fusion 360 file, so you can make changes if needed.

Also added following verions of the lid:

1. Lid with thermostat & filament passthrough
2. Lid with thermostat & without filament passthrough
3. Lid without thermostat & filament passthrough

Updates

Version 2.3
First public release here on makerworld

Version 2.4
I noticed that the tube often slides to deep into the box, so I added a small chamfer and a hole to be able to stick the filament on the upper part back into the box. This makes it way easier to grab the filament from the PFTE tube.
Added alto two pluges in case, the PTFE tube is not needed to cover the holes an keep the box airtight.

Credits

Thanks to dynarun for the inital design idea and rollers, which i added to this design. https://makerworld.com/en/models/39426