Bottom line: PETG suits functional parts that see moderate heat, impact and humidity: brackets, covers, jigs and housings. It is not ideal for high-temperature service or long UV exposure. The layer direction still decides strength more than the material name.
Suitable parts
| Part | Why PETG fits |
|---|---|
| Brackets and mounts | Toughness and moderate stiffness |
| Covers and housings | Impact resistance and finish |
| Jigs and fixtures | Dimensional stability |
| Parts with light chemical exposure | Better than PLA |
| Indoor functional parts | Good balance and cost |
Where PETG is weaker
- Sustained temperatures above its window.
- Long outdoor UV exposure.
- High stiffness requirements.
- Very high impact at low temperature.
Costly mistakes
- Using PETG in hot environments.
- Ignoring layer orientation.
- Printing wet filament.
- Over-compressing the first layer.
- Skipping functional tests.
Buyer / engineer checklist
- What is the service temperature?
- Is UV exposure involved?
- Is the load in-plane?
- Is the filament dry?
- Has the part been tested?
Describe the part and environment and we can confirm whether PETG fits.Material advice