Not everyone needs to buy a dryer on day one. Filament can be dried with equipment many workshops already own, provided the temperature is controlled accurately.
Food dehydrator
A food dehydrator is the closest thing to a dedicated filament dryer. It holds a steady low temperature over many hours, has airflow, and usually accepts a spool. It is the most predictable improvised option.
Household oven — useful but risky
Ovens are the most commonly suggested method and the most commonly regretted one. Most domestic ovens cannot hold a low set point accurately; the element cycles and the real air temperature can overshoot well above the target. Thermal runaway is what turns a spool into a fused, unusable disc. If you use an oven, verify the actual temperature with a separate thermometer first, keep the door slightly open, and never leave it unattended. Do not use a microwave.
Heated bed and a box
A simple enclosure over a heated bed works for gentle drying. Set the bed to the material's drying temperature, place the spool inside, and leave a small vent so moisture can escape. It is slow, but effective for PLA and TPU.
Desiccant does not dry filament
Silica gel and similar desiccants maintain a dry environment; they do not remove moisture that is already inside the polymer. Desiccant belongs in storage boxes, not in place of drying.
A practical sequence
- Dry the spool for the full recommended time for its polymer.
- Cool it before printing, still sealed if possible.
- Store it with fresh desiccant and a humidity indicator.
- Re-dry after long storage or after visible stringing returns.
Whichever method you use, record the temperature and time. A repeatable routine is worth more than a fast one.
Contact FilamentLab for drying recommendations by material, or browse our range.