Sunlu ASA 3D Printer Filament Red – 1.75 mm, Engineering Thermoplastic

Sunlu ASA 3D Printer Filament in red is a 1.75 mm engineering thermoplastic formulated for durable, weather-resistant parts. It combines UV and heat stability with mechanical strength to retain color, shape and functional properties after prolonged outdoor exposure. Diameter tolerance of ±0.02 mm and smooth extrusion support consistent print quality for functional prototypes, housings and outdoor components.

Advantages

ASA provides high resistance to UV radiation, rain and elevated temperatures while offering superior tensile and impact strength compared with common consumer filaments. The material exhibits good layer adhesion and dimensional stability, a high heat deflection temperature, and a print-ready consistency that reduces clogging and ensures predictable extrusion.

Suitable for

• Outdoor enclosures and housings for electronics
• Automotive trims and exterior fixtures
• Functional prototypes and mechanical parts exposed to weather
• Landscaping elements and exterior signage

When it may not be suitable

ASA is not ideal for fine decorative prints where a glossy, mirror-like finish is the primary goal; post-processing such as sanding or coating may be required to achieve that appearance. It also requires a heated bed and controlled printing temperatures, so it may not be the best choice for entry-level printers that cannot reach the recommended settings or maintain stable extrusion.

Key specifications

• Material: ASA (acrylonitrile-styrene-acrylate)
• Filament diameter: 1.75 mm (±0.02 mm)
• Density: 1.05 g/cm³
• Printing temperature: 250–260°C (50–100 mm/s) / 260–280°C (100–200 mm/s)
• Bed temperature: 80–100°C
• Print speed: 50–200 mm/s
• Curing temperature: 80°C
• Storage humidity: < 20% RH (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 resistance to UV, rain and temperature

How to use

Print with a nozzle temperature in the recommended range (250–280°C depending on speed) and a heated bed set to 80–100°C to reduce warping and improve adhesion. Use a sealed or semi-enclosed build chamber if possible and keep filament dry (store under <20% RH with desiccant). Adjust print speed between 50 and 200 mm/s according to detail and part size; slower speeds favor finer detail and stronger interlayer bonding. After printing, allow parts to cool gradually on the build plate to minimize distortion.

What to consider before purchase

• Require a printer capable of reaching 250–280°C nozzle temperatures and a heated bed
• Best used with a sealed or semi-enclosed printer or controlled ambient conditions
• Plan for filament drying and storage to maintain print quality
• May need post-processing for cosmetic surface finish

Usage recommendations

If you need durable, weather-resistant parts, set nozzle temperature according to your print speed, keep the bed at 80–100°C, use a heated chamber or enclosure when possible, and store the filament dry to preserve mechanical and visual properties.