Guide
PET vs PETG: what should you print with?
PETG is PET modified with glycols (often CHDM) to stay more amorphous and easier to print in FDM; “PET” filament grades behave more like a stiffer, often more demanding polyester.
Do not treat the labels as interchangeable. PETG is the usual default for an accessible functional desktop part. PET filament grades often chase higher stiffness or specific looks (e.g. clarity) but can be more sensitive to warping and tuning. See PET (FR) and PETG (EN). Wider framing: PLA vs PETG and pillar guide.
General-purpose functional part: start with PETG.
You want high stiffness or a specific PET behaviour and you can tune: explore a PET that matches your printer — follow the spool datasheet.
Result in under a minute
In short
Direct answer: for most “I want something solid without surprises”, PETG is the better first pick. Consider PET when you have a clear goal (stiffness, appearance) and time to dial in settings — always per brand.
Quick decision
PETG
Choose PETG if:
- Everyday functional housings, brackets, handled parts
- Moderate moisture — common desktop compromise
- You want broad community profiles and predictable behaviour
PET
Choose PET if:
- You need high stiffness or a PET-specific finish (per product)
- You can invest time in tuning and possibly enclosure
- The datasheet aligns with your service temperature and geometry
Summary table
| Criterion | PETG | PET (typical FDM) |
|---|---|---|
| Ease / profiles | High | Moderate to demanding |
| Stiffness (trend) | Good | Often very stiff |
| Default pick | Yes for general use | When needs are specific |
Quick verdict
Default to PETG for a hassle-free polyester. Use PET when you have a defined requirement and calibration budget.
Still between PLA and PET? PLA vs PETG.
Still unsure?
Matdecision walks through your need and points you toward a filament that fits your project.
Launch the Matdecision material selectorNeed a functional part?
The right polyester depends on usage, not only the label.
FAQ
Is PETG “PET with a plus”?
In simple terms it is modified PET for easier FDM; the glycol chemistry is what changes crystallisation and printability — not a vague marketing “plus”.
Can I reuse PETG settings for PET?
No — start from the manufacturer’s PET profile each time.