ABS vs ASA
ASA and ABS are close cousins with nearly identical strength, heat resistance, and printing requirements — both need an enclosure and ventilation. The key difference is UV stability: ASA resists sunlight without yellowing or becoming brittle, while ABS degrades outdoors over time. For anything that lives outside, ASA is the clear choice; ABS remains a slightly cheaper option for indoor parts and acetone smoothing.
ABS vs ASA: side by side
| Property | ABS | ASA |
|---|---|---|
| Strength | 4/5 | 4/5 |
| Flexibility | 2/5 | 2/5 |
| Heat resistance | 4/5 | 4/5 |
| Ease of printing | 2/5 | 2/5 |
| Surface finish | 3/5 | 3/5 |
| Nozzle temp | 230-260°C | 240-260°C |
| Bed temp | 90-110°C | 90-110°C |
| Enclosure needed | Yes | Yes |
| Ventilation needed | Yes | Yes |
| Hardened nozzle | No | No |
| Typical price | $22/kg | $30/kg |
Property scores are relative (1-5) for quick comparison. Acrylonitrile Butadiene Styrene vs Acrylonitrile Styrene Acrylate.
ABS is best for
ASA is best for
Which should you choose?
Choose ABS for indoor engineering parts and anything you plan to acetone vapor-smooth — ABS is a bit cheaper and slightly easier to find while delivering the same heat resistance.
Choose ASA for outdoor and UV-exposed parts — automotive exterior accessories, garden tools, anything in sunlight — where ASA's UV stability prevents the yellowing and cracking that would ruin an ABS part.