How to Dry PETG Filament: Temperature, Time & Storage Guide
PETG is relatively easy to print, but there is one issue that many 3D printing users eventually encounter:
moisture.
You open a spool that previously printed perfectly.
A few days or weeks later, you suddenly notice:
- More stringing
- Popping sounds
- Rough surfaces
- Small bubbles
- Poor layer adhesion
- Inconsistent extrusion
Before changing your entire slicer profile, check the filament.
It may simply need to be dried.
PETG has moderate moisture sensitivity. Compared with PLA, it generally requires more attention to dry storage and filament condition.
Does PETG Absorb Moisture?
Yes.
PETG can absorb moisture from the surrounding environment over time.
This doesn’t necessarily mean an opened spool will become unusable immediately.
However, moisture can gradually affect print quality, especially when the filament is stored in a humid environment.
This is why proper storage matters just as much as drying.
How Do You Know If PETG Is Wet?
There are several common warning signs.
1. Popping or Crackling
If you hear:
pop → pop → crackle
coming from the nozzle, moisture is one possible cause.
Water absorbed by the filament can turn into steam during extrusion.
2. Excessive Stringing
PETG naturally strings more than PLA.
But if a previously good spool suddenly starts producing heavy strings between every part, moisture should be one of the first things you check.
3. Rough or Uneven Surface
Wet filament can produce:
- Bubbles
- Pitting
- Rough surfaces
- Inconsistent extrusion
- A less uniform finish
4. Weak Layer Adhesion
Moisture can also affect extrusion consistency and print performance, potentially contributing to poor mechanical properties.
What Temperature Should You Use to Dry PETG?
A practical starting point is:
60–65°C
for approximately:
6–8 hours
Different manufacturers recommend different drying temperatures and times, so the specific filament manufacturer’s instructions should take priority. Current PETG drying guides commonly recommend roughly 60–65°C and several hours of drying time.
For Vertexfil PETG, you can use this as a practical starting profile:
Temperature: 65°C
Time: 6–8 hours
If the spool has been exposed to high humidity for an extended period, additional drying time may be necessary.
How to Dry PETG Filament
There are several ways to dry PETG.
Method 1: Filament Dryer
A dedicated filament dryer is usually the most convenient option.
Set the dryer to approximately:
60–65°C
and allow the filament to dry for several hours.
The advantage is that the temperature is designed specifically for filament drying and can be monitored more easily than improvised methods.
Method 2: Food Dehydrator
A food dehydrator can also work well if:
- Temperature can be controlled accurately
- The chamber fits the spool
- The actual temperature is appropriate for the filament
Again, follow the filament manufacturer’s recommended temperature whenever available.
Method 3: Kitchen Oven
An oven can potentially be used, but it requires more caution.
The biggest problem is temperature accuracy.
An oven set to 65°C may not actually maintain a uniform 65°C.
Before using an oven, check:
- Actual temperature stability
- Whether the spool material can tolerate the temperature
- Whether the oven can maintain a low temperature consistently
Avoid excessive temperatures.
PETG Drying Temperature Cheat Sheet
| Condition | Starting Point |
|---|---|
| Light moisture exposure | 60°C / 6 hours |
| Normal drying | 65°C / 6–8 hours |
| Heavily exposed spool | 65°C / 8+ hours |
| Storage | Sealed bag/container + desiccant |
These are practical starting points rather than universal rules. Always prioritize the filament manufacturer’s drying instructions when they are available.
Should You Dry PETG Before Every Print?
Not necessarily.
If your PETG is stored correctly in a sealed container with fresh desiccant, you may not need to dry it before every print.
However, drying becomes more useful when:
- The spool has been left exposed for a long time
- You live in a humid environment
- Stringing suddenly increases
- You hear popping from the nozzle
- The surface becomes rough
- Print quality changes unexpectedly
A good rule is:
If your PETG suddenly prints worse than it did before, check moisture before changing everything else.
How to Store PETG After Drying
Drying the filament is only half the job.
If you leave the freshly dried spool sitting in open air, it can gradually absorb moisture again.
For longer-term storage, use:
Airtight Storage
Keep PETG in:
- Sealed filament bags
- Airtight containers
- Dry boxes
Add Desiccant
Silica gel or another suitable desiccant can help reduce humidity inside the storage container.
Keep the Container Closed
Every time you open the container, humid ambient air can enter.
If you are not printing, close the container.
PETG vs PLA: Does PETG Need More Drying?
Generally, yes.
PLA is usually more forgiving when exposed to ambient humidity, while PETG has a higher need for moisture management.
This doesn’t mean PLA cannot absorb moisture.
It means PETG users are more likely to notice printing problems when moisture becomes significant.
Don’t Blame Retraction First
One of the most common mistakes when troubleshooting PETG stringing is immediately increasing retraction.
For example:
PETG starts stringing → increase retraction → still strings → increase again
This can create a cycle of unnecessary tuning.
Instead:
Check the filament first.
If the filament is wet, drying it may solve much of the problem before you touch your slicer settings.
After drying, then tune:
- Nozzle temperature
- Retraction
- Travel speed
- Cooling
- Flow
This makes troubleshooting much more systematic.
PETG Drying Checklist
Before printing a large PETG project:
☐ Is the filament dry?
☐ Has the spool been stored in a sealed container?
☐ Is there fresh desiccant?
☐ Is the nozzle temperature appropriate?
☐ Is the bed temperature appropriate?
☐ Is cooling set lower than PLA?
☐ Is your first layer calibrated?
If all seven are checked, you have a much better starting point for reliable PETG printing.
Need Reliable PETG Filament Supply?
For individual makers, filament quality affects print consistency.
For 3D printing retailers, distributors, and manufacturers, consistency becomes even more important.
Vertexfil supplies PETG filament for B2B applications, with support for bulk orders, color selection, packaging options, and wholesale supply.
If you’re sourcing PETG filament for your business, contact our team for pricing and product information.
Request PETG Wholesale Pricing
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FAQ
What temperature should PETG be dried at?
A practical starting range is around 60–65°C, but the exact temperature and drying time should follow the filament manufacturer’s recommendations.
How long should PETG be dried?
A common starting point is 6–8 hours, with longer drying potentially needed for heavily moisture-exposed filament.
Can you dry PETG in an oven?
Yes, but temperature accuracy is important. An oven that runs hotter than expected can damage the spool or filament.
Why is my PETG suddenly stringing?
Moisture is one common cause. Dry the filament first, then tune temperature and retraction.
How should PETG be stored?
Store it in an airtight container or sealed bag with desiccant and minimize exposure to ambient humidity.