ASA
Also known as Acrylonitrile Styrene Acrylate
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Also known as Acrylonitrile Styrene Acrylate
Last updated
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Acrylonitrile Styrene Acrylate (ASA) has emerged as a superior alternative to ABS in 3D printing, combining durability with exceptional resistance to weathering. Known for its ability to withstand UV exposure, heat, and harsh environments, ASA is the go-to filament for functional parts that thrive outdoors. From automotive components to garden fixtures, ASA bridges the gap between industrial-grade performance and practical printability.
ASA is a thermoplastic polymer engineered to excel in outdoor and high-stress environments. Its composition—acrylonitrile for chemical resistance, styrene for rigidity, and acrylate for UV stability—makes it a robust alternative to ABS. Unlike ABS, ASA retains its color and mechanical properties even after prolonged sun exposure, thanks to its UV-resistant acrylic ester elastomer.
ASA demands careful calibration to balance adhesion, warping, and layer bonding. Here’s how to optimize your prints:
Nozzle Temperature: 240–280°C (start at 250°C and adjust based on filament brand).
Bed Temperature: 90–110°C (heated bed essential for adhesion).
Print Speed: 35–70 mm/s (slower speeds improve layer bonding).
Ambient Temperature: Maintain a draft-free, warm environment or use an enclosed printer (60°C chamber ideal).
Build Plate: Use PEI sheets, BuildTak, or adhesion items such as Magigoo Original for reliable first-layer grip.
Enclosure (or warm ambient air): Critical for minimizing warping and cracking, especially in large prints.
Cooling: Reduce or disable part cooling fans to prevent rapid cooling and warping.
Fumes: ASA emits VOCs during printing; ensure proper ventilation or air filtration.
Moisture Sensitivity: Store filament in a dry, sealed container to prevent moisture absorption.
Stringing: Fine-tune retraction (1–2 mm at 20–30 mm/s) to minimize oozing.
UV Resistance: Retains color and strength under prolonged sun exposure, ideal for outdoor signs, automotive trim, and patio fixtures.
Thermal Stability: Heat deflection temperature of 86–96°C (1.8 MPa) outperforms PLA and rivals ABS.
Mechanical Strength: Tensile strength of 47.1 MPa and impact resistance of 180 J/m (notched) ensure durability in high-stress applications.
Chemical Resistance: Withstands oils, acids, and alkalis, suitable for industrial or automotive parts.
Post-Processing: Smoothable with acetone vapor for a polished finish, though should be taken with extreme caution due to the flammability of acetone.
Print Complexity: Requires warm ambient air, heated bed, and precise temperature control.
Fume Management: Strong odor during printing necessitates ventilation.
Not Food-Safe: Unsuitable for kitchenware or medical applications.
Material Sensitivity: Prone to warping if printed in humid or drafty environments.
UV Resistance
Excellent
Poor
Heat Resistance
86–96°C (HDT)
100–110°C (HDT)
Impact Strength
180 J/m (Notched)
200 J/m (Notched)
Print Difficulty
Moderate
Challenging
Outdoor Use
Ideal
Not Recommended
Automotive: Exterior trim, mirror housings, and under-hood components.
Outdoor Fixtures: Garden tools, patio furniture, and UV-resistant signage.
Industrial: Jigs, enclosures, and chemical-resistant parts.
Consumer Goods: Durable phone cases, outdoor toys, and sporting equipment.
Enclosure or warm ambient air
Not needed, but all-metal hotend is recommended if attempting to print above 240°C
