FilamentPicks is reader-supported. Some shopping links may be affiliate links. The temperatures below come from current manufacturer documentation; always prioritize the label or TDS for the exact spool you own.
How to dry PETG filament: match the temperature and time to the exact PETG formula and the drying device. Current Bambu PETG Basic and legacy Bambu PETG HF both list 65 °C for 8 hours in a blast drying oven, but their approved heatbed instructions are not identical. Third-party PETG can use different settings.
Last reviewed: August 14, 2026. These are equipment settings, not the air temperature reached inside an improvised container.
Signs your PETG may have absorbed moisture
- Popping or crackling during extrusion
- Bubbles or small voids in an extrusion line
- More stringing or oozing than the same profile produced previously
- A rough or inconsistent surface
- Reduced layer consistency
These symptoms are clues, not proof. Excessive nozzle temperature, a partial clog, unsuitable retraction, a worn nozzle or an incorrect flow profile can look similar. Drying is a useful controlled test when a previously reliable spool changes after humid storage.
PETG drying temperature and time chart
| Exact material | Blast drying oven | AMS 2 Pro / AMS HT | Supported heatbed method |
|---|---|---|---|
| Bambu PETG Basic (current) | 65 °C for 8 h | 65 °C for 8 h | 80 °C for 12 h on the Bambu printer series named in the current product instructions |
| Bambu PETG HF (legacy) | 65 °C for 8 h | Use the material profile shown by the current device/software; the older HF page predates some drying hardware | 75–85 °C for 12 h on an X1-series heatbed, following Bambu’s method |
| Polymaker PETG (current) | 60 °C for 6 h when moisture has been absorbed, per the current product page | Enter only a setting supported by the spool maker and device | No substitution for the manufacturer’s specified dryer unless its documentation approves one |
| Other third-party PETG | Follow the exact spool label or TDS | Do not assume Bambu RFID settings apply | Use only an officially documented method |
Formula names and drying guidance can change. Record the exact product name and revision when saving a drying profile, and recheck the manufacturer page before applying an old preset to a newly purchased spool.
Method 1: use a vented, temperature-controlled filament dryer
- Confirm the exact material and manufacturer drying setting.
- Verify that the dryer can actually hold that temperature; marketing range and measured chamber temperature are not always identical.
- Allow moisture to leave the chamber using the device’s designed venting or active exhaust.
- Run the stated time, then print from the dryer or transfer the spool directly to sealed storage.
A dryer capped at 55 °C is not a match for a product whose manufacturer specifies 65 °C. Conversely, raising a low-temperature spool above its TDS is not a shortcut. Excess heat can deform a spool or damage filament.
Method 2: use AMS 2 Pro active drying
AMS 2 Pro supports active venting and temperatures up to 65 °C. Bambu says RFID can automatically match drying settings for supported official filaments. For a third-party spool, select the exact supported temperature and time manually; do not label every PETG as Bambu PETG Basic.
On some X1/P-series installations, the drying function requires the power accessory specified by Bambu. Confirm that active heating is available in your setup rather than assuming a normal AMS connection powers it.
Method 3: use a Bambu heatbed only where documented
A heatbed setting is higher than a blast-dryer setting because it heats a surrounding space indirectly. That does not mean the filament itself should be placed in an 80 °C food dehydrator. Follow Bambu’s complete heatbed procedure for the named printer and spool, including the approved cover/packaging arrangement and safety clearances.
Do not improvise a cardboard cover, seal vents, leave a printer unattended against its instructions, or generalize the X1 procedure to every open-frame printer. If the exact printer/material combination is not in the official method, use a dedicated dryer instead.
How to keep PETG dry
- Move the spool to a sealed container with fresh desiccant after drying.
- For Bambu PETG Basic/HF, the product pages specify storage and printing below 20% RH in a sealed container with desiccant.
- Use a hygrometer as a trend indicator; its reading describes the air in the container, not moisture inside the filament core.
- During a long print in humid air, feed from a dry box or supported drying system when the material maker recommends it.
- Re-dry based on symptoms and manufacturer guidance, not a fixed weekly schedule.
Frequently asked questions
Should I dry every brand-new PETG spool?
Follow the product instructions. Some manufacturers recommend drying before first use; others recommend it only after humid exposure or when symptoms appear. Packaging is not a measurement of the filament’s current moisture content.
Can PETG be dried in a kitchen oven?
A food oven is a poor default because many units overshoot at low settings and may contaminate food-contact equipment. A dedicated, temperature-controlled filament dryer is safer and more repeatable.
Can PETG be over-dried?
The practical risk is excessive temperature or an unsupported duration, which can deform the spool or affect the polymer. Stay within the exact material manufacturer’s guidance.
What if stringing remains after drying?
Check nozzle temperature, travel path, retraction, flow, nozzle condition and filament profile. Use the PETG stringing troubleshooting guide instead of repeating drying cycles indefinitely.
Related guides
This URL stays focused on PETG and Bambu-specific methods. Use How to Dry Filament for the all-material chart, PETG Print Settings for Bambu Lab for slicing and calibration, and How to Store Filament for long-term storage.
Primary sources: Bambu PETG Basic product instructions; Bambu PETG HF product instructions; Bambu AMS 2 Pro specifications; Polymaker PETG product page.