Filament Dry Box with a Humidity Monitor
Wet filament causes stringing and weak prints. Seal spools with desiccant and get an alert when humidity rises.
In humid places like Florida, PETG, TPU and nylon absorb water fast. An airtight box, desiccant and an ESP32 humidity sensor keep your filament print-ready.
Video tutorial
Video by 3DRundown, embedded from YouTube. The written steps below are our own and match the parts list.
Mission steps
Pick an airtight container
A cereal-style box with a gasket lid holds one or two spools.
Add desiccant
Use rechargeable silica gel in a mesh bag or printed holder.
Print the sensor enclosure
Print the vented ESP32 enclosure from the Vault and mount it inside the lid.
Flash ESPHome
Add the BME280 to an ESPHome config (see the room sensor guide).
Alert
Notify when humidity goes over 25–30%, the cue to recharge the desiccant.
Questions
How do I recharge silica gel?
Follow the manufacturer's directions — many indicating beads are dried in an oven at low temperature until they change color back.