ABS and ASA are close cousins that print almost the same way. The difference is the sun. ASA resists UV and weather. ABS does not, but it costs less and is fine indoors.
How they compare
The table shows where each one wins. ASA leads UV and outdoor use. ABS leads cost.
| Property | ABS | ASA |
|---|---|---|
| UV resistance | Low | High |
| Heat resistance | High | High |
| Outdoor weathering | Poor | Good |
| Cost | Medium | High |
| Fumes | Strong | Strong |
| Needs enclosure | Yes | Yes |
| Best for | Indoor parts | Outdoor parts |
When to pick ASA
Pick ASA for anything that sees 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 its color and shape outdoors where ABS turns yellow and brittle.
When to pick ABS
Pick ABS for indoor functional parts where UV does not matter. The Polymaker PolyLite ABS sheet lists a nozzle of 245 to 265 °C and a bed of 90 to 100 °C. ABS costs less than ASA and takes acetone smoothing.
Frequently asked
Is ASA better than ABS for outdoor use?
Does ASA print like ABS?
Is ASA stronger than ABS?
Can I use ABS outside if I paint it?
To go deeper, read the ABS guide or the ASA guide. For related picks, see PETG versus ABS or PETG versus ASA.
Related guides
Related
Sources & methodology
4 citations · reviewed 2026-07-09- 01Polymaker PolyLite ABS Product Information Sheetaccessed 2026-07-09Tier 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