Sunlu ASA filament blue — Sunlu ASA KB outdoor-grade 3D printing filament

Sunlu ASA filament in Klein Blue is an outdoor-grade 3D printing material formulated for durable functional parts and applications exposed to weather. As an ASA (acrylonitrile-styrene-acrylate) filament, it combines UV and moisture resistance with dimensional stability and good mechanical properties to keep prints stable in color and shape during prolonged outdoor use.

Advantages

The filament provides high resistance to UV radiation, rain and temperature changes, plus improved mechanical strength compared with common hobby materials. Tight diameter tolerance (±0.02 mm) and smooth extrusion support consistent print quality and good layer adhesion, while the material’s heat and impact resistance deliver long-lasting parts suitable for real-world outdoor use.

Suitable for

• Outdoor housings, covers and fixtures
• Automotive trims and exterior parts
• Functional prototypes that require weather resistance
• Landscaping elements and outdoor installations

When it may not be suitable

Sunlu ASA may not be the best choice for indoor decorative prints where ease of printing and glossy finish are the primary concerns; PLA or other aesthetic-focused filaments can be easier to print and finish. It also requires a heated bed and relatively high nozzle temperatures, so it may be unsuitable for printers that cannot reach recommended temperature ranges.

Key specifications

• Material: ASA (acrylonitrile-styrene-acrylate)
• Color: Klein Blue
• Filament diameter: 1.75 mm (±0.02 mm)
• Density: 1.05 g/cm³
• Recommended printing temperature: 250–260°C (for 50–100 mm/s) and 260–280°C (for 100–200 mm/s)
• Build plate temperature: 80–100°C
• Recommended print speed: 50–200 mm/s
• Curing/storage condition: cure at 80°C; store at < 20% RH in a sealed container with desiccant
• Vicat softening temperature: 105°C
• Heat deflection temperature: 96°C
• Melting temperature: 120°C
• Melt flow index: 15.5 g/10 min
• Tensile strength: 50 MPa
• Flexural strength: 73 MPa
• Flexural modulus: 2144 MPa
• Elongation at break: 20%
• Impact resistance: 18 kJ/m²
• Weather resistance: high (UV, rain, temperature)

How to use

Load the Klein Blue Sunlu ASA filament into a compatible FDM/FFF printer equipped with a heated bed. Set the nozzle temperature within the recommended range depending on print speed (typically 250–280°C) and the bed to 80–100°C. Use a well-leveled build plate and appropriate adhesion aids to reduce warping. Print with moderate cooling or minimal part cooling to improve layer bonding, then allow parts to cool gradually. After printing, parts can be dried or post-cured at 80°C if required for dimensional stability.

What to consider before purchase

• Verify your printer can reach nozzle temperatures up to 280°C and a bed temperature of 100°C.
• Plan for proper part adhesion (heated bed, adhesion surface or skirt/brim) to limit warping.
• Ensure you can store filament in a sealed container with desiccant to keep humidity below 20% RH.
• Consider whether the blue color and matte/functional finish suit the intended application.

Usage recommendations

For best results with Sunlu ASA (Klein Blue), print with a heated bed (80–100°C), nozzle temperatures between 250–280°C based on speed, limited part cooling, and store spool dry. Use brims or rafts for larger flat parts and allow parts to cool slowly to minimize warping.