Wet filament causes more failed prints than almost any other single issue. The symptoms — crackling sounds, stringing, rough surface texture, bubbling at the nozzle, weak layer adhesion — all point to one problem: moisture absorbed into the filament. The fix is straightforward once you know the correct temperature and time for each material. This guide covers all of them.
Why Filament Absorbs Moisture
Almost all 3D printing filaments are hygroscopic, meaning they actively draw in moisture from the surrounding air. Some absorb it quickly enough that leaving a spool out overnight in a humid room will affect print quality. The internal moisture turns to steam inside the hot end, creating micro-bubbles that disrupt the melt flow, weaken layer adhesion, and push extra material out during travel moves — causing stringing.
Filament Drying Temperature and Time — All Materials
These are the recommended drying parameters for Overture filaments, based on the material's thermal properties and spool construction:
PLA — 50°C (122°F) for 7 hours
PETG — 65°C (149°F) for 7 hours
TPU 95A — 70°C (158°F) for 7 hours
ABS — 75°C (167°F) for 7 hours
ASA — 75°C (167°F) for 7 hours
Nylon (Easy PA) — 95°C (203°F) for 7 hours
Never exceed the listed temperature for each material. PLA in particular will soften and tangle on the spool if dried above 55°C — it begins to deform at 64°C. Nylon requires the highest temperature and needs a dedicated dryer that can reach 95°C; most food dehydrators cannot.
What Temperature to Dry PLA Filament
The correct PLA drying temperature is 50°C (122°F) for 7 hours. Because PLA softens at around 64°C, it must be dried at a lower temperature than other materials — never use a setting above 55°C or the filament loops may fuse together on the spool. A food dehydrator on its lowest setting works perfectly. PLA absorbs moisture more slowly than PETG or Nylon, so freshly opened spools stored in a sealed bag typically do not need drying. Dry PLA if you notice crackling during printing, stringing that doesn't resolve with retraction changes, or surface texture that looks rough and uneven.
Overture PLA Filament 1.75mm is vacuum-sealed with desiccant from the factory. Store unused filament in the original bag between sessions.
What Temperature to Dry PETG Filament
The correct PETG drying temperature is 65°C (149°F) for 7 hours. PETG is significantly more hygroscopic than PLA and absorbs moisture rapidly — a spool left open overnight in a humid room may already show moisture symptoms. Wet PETG is the leading cause of excessive stringing in PETG prints. Even with perfectly tuned retraction and temperature settings, wet PETG will string. Drying for the full 7 hours at 65°C usually resolves stringing that nothing else has fixed. Always dry PETG before a critical print if the spool has been open for more than a week.
Overture PETG Filament 1.75mm — vacuum-sealed packaging. Dry before use after extended storage.
What Temperature to Dry TPU Filament
The correct TPU drying temperature is 70°C (158°F) for 7 hours. TPU is one of the most moisture-sensitive filaments and should be treated as always needing drying in humid climates, even from a freshly opened spool. Wet TPU produces extreme stringing, rough surface texture, and weak layer bonds. Because TPU is flexible, moisture damage is often more severe than with rigid filaments. Dry TPU before every print session if you live in a humid climate or store filament in a non-climate-controlled environment.
Overture TPU Filament 95A (1kg) |
Overture High Speed TPU (1kg) — both benefit from drying before use.
What Temperature to Dry ABS and ASA Filament
Both ABS and ASA should be dried at 75°C (167°F) for 7 hours. ABS and ASA absorb moisture moderately but both require enclosed-printer printing at high temperatures, which means any moisture present gets amplified inside the enclosure. Dry both materials before printing if the spool has been stored open for more than a few days.
Overture ABS Filament 1.75mm |
What Temperature to Dry Nylon Filament
Nylon must be dried at 95°C (203°F) for 7 hours — the highest drying temperature of any common 3D printing material. Nylon (polyamide) is extremely hygroscopic and can absorb enough moisture in 30 minutes of open-air exposure in a humid room to significantly degrade print quality. A dedicated filament dryer that reaches 95°C is required; most food dehydrators top out at 70°C and are not suitable for Nylon. After drying, use Nylon directly from the dryer box or immediately seal in a vacuum bag. Leaving Nylon out for even a short time will reverse the effects of drying in humid conditions.
Overture Easy Nylon Filament 1.75mm — always dry at 95°C before printing.
Best Methods for Drying Filament
Food Dehydrator
The most accessible method for most users. A dehydrator with adjustable temperature handles PLA (50°C), PETG (65°C), and TPU (70°C). ABS and ASA require 75°C — check your dehydrator's maximum temperature. Nylon at 95°C is beyond most consumer dehydrators. Run the full 7 hours without interruption for complete moisture removal.
Dedicated Filament Dryer Box
The best option for frequent use or for hygroscopic materials like Nylon and TPU. Filament dryer boxes maintain a precise, stable temperature throughout drying, include a humidity sensor so you can monitor progress, and many allow printing directly from the box — keeping the filament dry throughout long prints.
Household Oven
Can work but requires caution. Most ovens run 10–20°C hotter than indicated below 100°C. Use an oven thermometer to verify actual temperature before placing filament inside. Leave the oven door slightly ajar to allow moisture vapor to escape. Never use the convection fan setting — forced airflow can tip spools and tangle the filament.
How to Store Filament After Drying
Drying removes moisture, but without proper storage the filament will re-absorb it within hours — faster for Nylon and TPU, slower for PLA.
• Seal in an airtight bag or container immediately after removing from the dryer
• Include fresh silica gel desiccant packets — orange indicating gel shows saturation visually
• For Nylon and high-moisture-risk materials, use vacuum-sealed bags
• Store in a cool, dry location — avoid garages, basements, or anywhere with humidity fluctuations
• Replace desiccant when packets show saturation (color change or weight gain)
Frequently Asked Questions
Does PLA need to be dried before printing?
PLA does not always need to be dried before printing, especially from a freshly opened vacuum-sealed spool stored in a sealed bag. However, PLA that has been stored on an open shelf for weeks or months, or in a humid environment, will benefit significantly from drying at 50°C for 7 hours. If your PLA print shows crackling sounds from the nozzle, unexpected stringing, or a rough bumpy surface, drying will almost certainly improve quality.
How do I know if my filament needs drying?
The clearest sign is a crackling, popping, or hissing sound coming from the nozzle during printing — this is moisture turning to steam. Other signs include small bubbles or foam visible at the nozzle tip, unexpected stringing that persists after retraction tuning, rough or uneven surface texture on finished prints, and brittle filament that snaps easily when bent. Any of these symptoms, especially in humid climates, indicate moisture absorption.
Can I over-dry filament?
Yes — drying for significantly longer than 7 hours, or at temperatures above the recommended maximum, can make filament brittle, cause PLA to soften and tangle on the spool, or degrade material properties. Stick to the recommended temperature and 7-hour duration for each material. If you suspect severe moisture absorption, a second drying cycle is safer than extending a single session.
What happens if you print with wet filament?
Printing with wet filament produces crackling sounds and steam at the nozzle, bubbles and foam in the extruded material, rough or uneven surface texture, excessive stringing, weak layer adhesion, and brittle finished prints. In severe cases it can cause nozzle clogs. Drying the filament before printing eliminates all of these issues.
