This could be the Easiest and Cheapest DIY Filament Dryer.
Component list:
Hatching thermostat
3 meters of cable
Plug
Hygrometer (optional)
15-watt incandescent bulb
Lamp fitting
Plexiglass, custom cut for box size 30cm x 21cm x 10cm
M3 nuts and bolts, pneumatic adapter, PTFE tube
3D-printed brackets, you can use this STLs https://drive.google.com/drive/folders/11ES_OMTNbWrXZaUNCkDtW5W8VuB3f9px?usp=sharing