* K2 Plus and other large-format printers, use Bin.stl

* Standard-format printers, use the Left Bin and Right Bin .stl files

* The Pocket and Lid .stl files are universal

* Both formats are available as .3mf project files above - all files can be printed without supports

Airflow Desiccant Box for Creality CFS

This insert converts the unused cavity in the Creality CFS multi‑filament system into a passive desiccant chamber. It uses slanted ventilation and modular pockets to maximize airflow and ease of maintenance.

I use this model in my system and have had great results. With or without pockets, the humidity level inside the unit sits at ~3%.

Design Overview:

Ventilation Geometry: The outer shell and optional inner pockets feature slanted ventilation slots along the sides that angle inward toward the desiccant. This orientation encourages air to flow through the desiccant beads. Perforations in the base further promote convection while keeping even small or broken beads contained inside the chamber.

Curved-Lip Pockets: Each removable pocket has a curved lip on the inner rim. This lip acts as both a funnel for pouring desiccant beads neatly and a grip point for placing or removing pockets without spilling. The pockets are optional: users can fill the main bin directly for maximum capacity or use the pockets for faster swap‑outs.

Attachment Method: The insert rests in the cavity and can be secured with small strips of velcro or double‑sided tape. This light adhesion keeps the bin stable and allows for easy removal for refilling.

Snap-On Lid: A separate lid presses firmly over the top of the insert. Once closed, it prevents beads from escaping while still allowing air exchange through its perforations.

Additional Notes

Printing and Material Choice: I've printed everything using both PLA and PETG using Creality Print's default settings, both work just fine. No supports are required.

No Interference: The insert’s footprint is matched to the CFS interior so it doesn’t interfere with spool operation or filament paths. The 12-degree slant of the bin matches the slant of the interior, resulting in a vertically-standing unit.

Maintenance: When the desiccant needs recharging, remove the lid, lift the pockets by the curved lip, replace or refill, and snap the lid back on. This minimizes the amount of time the CFS unit needs to be open.

Fair warning, this is a long print due to the intricacy of the ventilation holes - for large-format users, consider printing the standard-format unless you have a preference for a single piece. The standard-format takes almost 6 fewer hours to print. I don't know why.

Airflow CFS Desiccant Mod

Standard-Format Desiccant Box

Large-Format Desiccant Box

0.2mm layer, 2 walls, 15% infill