PETG or ASA: which filament fits your functional part?
PETG is easier to print and works well for a wide range of functional parts. ASA becomes more attractive when a part will be exposed to sunlight, UV radiation or higher temperatures for long periods. For indoor parts and protected outdoor uses, PETG is often the more practical choice. For permanently exposed outdoor parts, ASA has clear advantages.
Comparison
| Property | PETG | ASA |
|---|---|---|
| Printability | easier | more demanding |
| Warping | low to moderate | significantly higher |
| UV resistance | usable | very good |
| Outdoor use | often suitable | especially suitable |
| Moisture | good | good |
| Enclosure | usually optional | often useful |
| Functional parts | very good | very good |
| Heat resistance | good | higher |
Choose PETG when …
- easy processing matters
- the part is used indoors or in a protected location
- moisture is present
- toughness is important
- you want to reduce warping risk
Choose ASA when …
- the part is exposed to UV for long periods
- it will remain outdoors
- higher temperatures are expected
- you have a suitable enclosed printing environment