PETG
PETG filament — properties and applications
PETG (glycol-modified polyethylene terephthalate) is tougher and more heat-resistant than PLA, while printing more easily than ABS. It is a balanced choice for functional parts.
Key properties
- Typical printing temperature 230–250 °C, bed 70–85 °C.
- Higher layer adhesion and impact resistance than PLA.
- Heat resistance around 70–80 °C; slightly flexible.
- Reasonable resistance to chemicals and moisture.
- Prone to stringing.
Use cases
- Functional mechanical parts (brackets, holders)
- Liquid and food containers (with suitable certification)
- Semi-outdoor and outdoor applications
- Home appliances and vehicle accessories
Advantages
- Tough, impact-absorbing and durable
- Higher heat and moisture resistance than PLA
- Good layer adhesion on large parts
Limitations
- Stringing and surface artefacts require tuning
- Requires slower printing; excessive cooling harms adhesion
- Support marks and scratching are visible on some surfaces
Frequently asked questions
Is PETG food-safe?
The filament itself may be food-approved, but the gaps between layers can harbour bacteria. Food contact requires a suitable filament and post-processing.
PETG or ABS?
Choose PETG when impact resistance and easy printing matter; choose ABS when high heat resistance and acetone vapour smoothing are needed.
Why does PETG ooze?
High temperature and/or moisture in the filament cause oozing. Drying the filament and tuning temperature and retraction are required.