ABS vs ASA Filament: Outdoor & High-Temp Printing Guide
When your prints need to survive heat, UV exposure, or tough mechanical stress, PLA won't cut it. ABS and ASA are two of the most popular engineering-grade filaments for demanding applications — but they have key differences that affect which one is right for your project. This guide breaks it all down.
What Is ABS?
ABS (Acrylonitrile Butadiene Styrene) has been a staple of 3D printing since the beginning. It's strong, impact-resistant, and handles heat far better than PLA. It's also machinable and sandable, making it popular for functional prototypes and enclosures.
Best for: Indoor functional parts, enclosures, prototypes, parts that need post-processing
Print temp: 230–250°C | Bed temp: 100–110°C | Enclosure: Strongly recommended
What Is ASA?
ASA (Acrylonitrile Styrene Acrylate) was developed as a direct upgrade to ABS. It offers similar strength and heat resistance but adds excellent UV stability — meaning it won't fade, yellow, or become brittle when exposed to sunlight. It's the go-to choice for anything that lives outdoors.
Best for: Outdoor parts, automotive components, garden fixtures, signage, anything exposed to sunlight
Print temp: 240–260°C | Bed temp: 90–110°C | Enclosure: Strongly recommended
ABS vs ASA: Side-by-Side Comparison
| Property | ABS | ASA |
|---|---|---|
| Heat resistance | ~98°C (HDT) | ~98°C (HDT) |
| UV resistance | ❌ Poor — yellows & degrades | ✅ Excellent — stable outdoors |
| Impact resistance | High | High |
| Ease of printing | Moderate (warps easily) | Moderate (slightly easier than ABS) |
| Warping tendency | High | Moderate–High |
| Fumes during printing | Strong (styrene) | Moderate (less than ABS) |
| Post-processing | Excellent (acetone smoothing) | Good (sanding, painting) |
| Outdoor durability | Poor long-term | Excellent long-term |
When to Choose ABS
- Your part will be used indoors and won't see direct sunlight
- You want to acetone-smooth your prints for a glossy, seamless finish
- You need a well-established material with lots of community support
- You're printing enclosures, brackets, or mechanical parts for indoor use
When to Choose ASA
- Your part will be exposed to sunlight, rain, or outdoor conditions
- You need long-term color stability (no yellowing or fading)
- You're printing automotive parts, outdoor fixtures, or garden accessories
- You want slightly easier printing than ABS with similar performance
Print Settings for ABS & ASA
The #1 Rule: Use an Enclosure
Both ABS and ASA are prone to warping and layer delamination when exposed to drafts or temperature fluctuations. An enclosure that traps heat around the print is essential for reliable results. Without one, expect cracking and failed prints on larger parts.
ABS Settings
- Nozzle: 230–250°C
- Bed: 100–110°C with PEI or ABS slurry
- Cooling fan: Off or minimal (10–20%) — too much cooling causes layer splitting
- Print speed: 40–60 mm/s
- First layer: Slow down to 20 mm/s; use a brim for large parts
ASA Settings
- Nozzle: 240–260°C
- Bed: 90–110°C with PEI or glue stick
- Cooling fan: Off or very low (0–15%)
- Print speed: 40–60 mm/s
- First layer: 20 mm/s; brim recommended for large flat parts
Ventilation Warning
Both ABS and ASA release fumes during printing — ABS in particular emits styrene, which can be harmful with prolonged exposure. Always print in a well-ventilated area or use an enclosure with a HEPA + activated carbon filter. Never print these materials in a bedroom or unventilated space.
Post-Processing
ABS can be smoothed with acetone vapor for a near-injection-molded finish — a technique not possible with most other filaments. ASA doesn't respond to acetone the same way, but it sands and paints beautifully and holds paint better than ABS outdoors due to its UV stability.
Shop ABS Filament at Ferz Supply
Ready to print tough? Browse our IIID Max ABS filament for reliable, high-performance results on your next engineering project. For outdoor applications, check our full 3D printing filament collection for the latest ASA options.