Check the filament type and recommended drying temperature from the manufacturer
Remove the spool from the printer
Place the filament in a filament dryer, food dehydrator, or oven with accurate low-temperature control
Set the temperature according to the filament type
Dry for the recommended time
Keep the spool in the dryer while printing if possible
Store the filament in an airtight container with desiccant after drying
Avoid overheating the filament
Do not use high heat unless the filament type allows it
Re-dry the filament if printing quality drops or moisture is suspected