Bottom line: transparent PETG clarity depends on void-free extrusion, good layer fusion and a smooth surface. Layer height, flow, temperature and cooling matter more than the grade name alone. Any trapped air scatters light and makes the part look cloudy.
What reduces clarity
| Factor | Effect |
|---|---|
| Internal voids | Light scattering |
| Poor layer fusion | Visible interfaces |
| Large layer height | Visible ridges |
| Over-cooling | Micro-cracks |
| Moisture | Bubbles and haze |
Improvement steps
- Dry the filament thoroughly.
- Reduce layer height.
- Increase wall count to remove voids.
- Raise temperature moderately for fusion.
- Slow the outer wall and balance cooling.
Costly mistakes
- Printing wet PETG.
- Low infill leaving internal gaps.
- Excessive cooling.
- High wall speed.
- Judging clarity under poor lighting.
Buyer / engineer checklist
- Is the filament dry?
- Is layer height small enough?
- Are internal voids minimised?
- Is layer fusion adequate?
- Is the finish acceptable?
Share the part thickness and settings and we can help improve clarity.Clarity advice