Polymaker ASA-CF08 Black Carbon Fiber 1.75mm 3KG - Tough Outdoor

In this review of Polymaker ASA-CF08 Black Carbon Fiber filament, the bottom line is clear: this spool is aimed at makers and professionals who need high rigidity and long-term outdoor performance. The filament combines ASA with 8% carbon fiber by weight to deliver strong bending and tensile values while offering a matte finish that conceals layer lines. It is especially useful for functional prototypes, housings and load-bearing parts exposed to sun or weather where heat resistance and UV stability matter most.

Key Features

• Carbon fiber reinforcement: Infused with 8% carbon fiber for increased bending strength and stiffness, making parts more dimensionally stable under load.
• High heat resistance: With a 103 C HDT (@0.45 MPa), printed components keep mechanical integrity in hot, sun-exposed applications.
• Outdoor durability: Engineered for UV and weather resistance so enclosures, fixtures and vehicle parts last longer outdoors.
• Professional surface finish: Prints a matte finish that helps hide layer lines, producing aesthetic components without heavy post-processing.
• Easy to print: Designed to run smoothly at speeds up to 350 mm/s with reduced warping and strong bed adhesion even without a heated chamber.
• Packaged ready to use: Each 3KG spool is vacuum-sealed and tangle-free to protect filament quality and reduce moisture issues.

Who It's For

This filament is best for engineers, fabricators and advanced hobbyists who need functional, load-bearing parts that must withstand heat and outdoor exposure, such as automotive components, marine fixtures and construction parts. It suits users who value a matte, professional finish and need the extra stiffness carbon fiber provides.

It is less suitable for complete beginners or printers that cannot accept abrasive materials; the filament is brittle and abrasive so a hardened nozzle is recommended and multi-material setups may need special handling.

Pros & Cons

Pros

• Excellent mechanical properties with high bending and tensile strength for functional parts.
• Resists UV and weathering, making it appropriate for outdoor applications.
• Matte surface finish hides layer lines and looks professional on housings and prototypes.
• Vacuum-sealed, tangle-free spools reduce moisture-related print issues.

Cons

• Abrasive and brittle nature requires a hardened or ruby nozzle and careful handling in multi-material systems.
• Price may feel high to some users, though durability and properties justify the cost for demanding uses.

Specifications

Material	ASA with 8% carbon fiber
Diameter	1.75 mm
Weight	3KG spool
Bending strength (XY)	69.1 MPa
Tensile strength (XY)	43.5 MPa
Heat deflection (HDT)	103 C @0.45 MPa

Our Verdict

Polymaker ASA-CF08 is a strong choice when you need a durable, heat resistant filament that prints with a professional matte finish and survives real-world outdoor exposure. Professionals and experienced makers will appreciate the mechanical performance and ease of printing, while beginners should be aware of nozzle wear and brittleness. For demanding functional parts, it represents good value for its durability.

Frequently Asked Questions

Do I need a hardened nozzle?
Yes. Because ASA-CF08 is abrasive and contains carbon fiber, a hardened steel or ruby nozzle is recommended to avoid rapid wear.

Is this filament suitable for outdoor parts?
Yes. It is formulated for enhanced UV and weather resistance and maintains strength up to its 103 C HDT, making it suitable for sun-exposed fixtures and enclosures.

Will it warp on open printers?
The filament is designed for reduced warping and good bed adhesion, and many users report successful prints without a heated chamber, though part size and printer setup still matter.