PETG and ASA are both tough, but they belong in different places. PETG is the easy tough filament for indoors. ASA is the outdoor specialist that resists UV damage.
How they compare
The table splits them on the axes that matter. PETG leads ease. ASA leads UV and heat.
| Property | PETG | ASA |
|---|---|---|
| Ease of print | Medium | Hard |
| UV resistance | Low | High |
| Heat resistance | Medium | High |
| Outdoor weathering | Fair | Good |
| Fumes | Low | Strong |
| Needs enclosure | No | Yes |
| Best for | Indoor tough parts | Outdoor parts |
When to pick PETG
Pick PETG for tough parts that stay indoors or in shade. It prints at 240 to 260 °C with no enclosure, per the Prusament PETG datasheet. It is the easier path to a durable part.
When to pick ASA
Pick ASA for parts that see sun or weather. The Prusament ASA datasheet lists a nozzle of 260 °C with a 10 °C margin and a heat deflection of 93 °C. ASA holds color and strength outdoors where PETG yellows and weakens.
Frequently asked
Is PETG or ASA better for outdoor use?
Is ASA harder to print than PETG?
Which is stronger, PETG or ASA?
Can I use PETG outside?
To go deeper, read the PETG guide or the ASA guide. For related picks, see PETG versus ABS or ABS versus ASA.
Related guides
Related
Sources & methodology
4 citations · reviewed 2026-07-09- 01Prusament PETG Technical Datasheetaccessed 2026-07-06Tier 1
- 02Prusament ASA Technical Datasheetaccessed 2026-07-09Tier 1
- 03All3DP All 3D Printing Filament Types Explainedaccessed 2026-06-29Tier 2
- 043DSourced Complete 3D Printer Filament Guideaccessed 2026-06-29Tier 2