Filament Drying Guide: Symptoms, Temperatures, and What Works
Updated 2026-06-11 · by Jay
Moisture is the silent print-killer: filament absorbs water from the air, and at the nozzle that water flashes to steam — leaving voids, surface fuzz, and weak layers.
Symptoms checklist
- Audible popping/crackling during printing (steam escaping)
- Stringing that settings used to control
- Matte, rough, or bubbled surfaces on a previously glossy profile
- Brittle filament snapping at the spool
- Sudden layer adhesion loss
Any of these on a spool that printed well before = dry it before touching slicer settings.
Drying temperatures and times
| Material | Temperature | Time |
|---|---|---|
| PLA | 45–50°C | 4–6 h |
| PETG | 60–65°C | 4–6 h |
| ABS / ASA | 65–70°C | 4–6 h |
| TPU | 50–55°C | 6–8 h |
| Nylon (PA) | 75–80°C | 8–12 h |
| PVB | 55–60°C | 6–8 h |
| PC | 80–90°C | 8–12 h |
Stay under each material's glass-transition temperature — that's the line between drying a spool and fusing it into a $25 paperweight.
Methods, ranked
- Purpose-built filament dryer ($30-80): accurate, safe, some feed the printer while drying. The boring right answer — see our picks for the best filament dryers.
- Food dehydrator ($30-50): excellent temperature stability; may need trays removed to fit a spool.
- Filament dry box with heater: dries AND stores — best for nylon/TPU workflows.
- Kitchen oven: works only if verified with a separate thermometer — most ovens swing ±15°C at low settings, which is exactly how spools fuse. Last resort.
After drying
Seal it: dried filament in humid air re-absorbs within days. A bag with desiccant — or printing straight from the dryer/dry box — keeps the work done.