Technical PET filament for strong and precise parts

Elegoo PET-CF Carbon Fiber Black combines PET with short carbon fiber reinforcement. The result is a stiff composite filament designed for functional components where mechanical stability, precise geometry, and reliable performance during long-term use are important.

Carbon reinforcement reduces shrinkage and corner lifting, allowing dimensionally accurate parts with clean edges to be printed. Prints have a finely textured matte black surface on which individual layers are less visible.

Main advantages of Elegoo PET-CF

• High stiffness and strength for mechanically stressed components
• Low warping tendency and good dimensional stability
• Low moisture absorption compared to many technical filaments
• Matte, finely textured surface with less visible layers
• Suitable for precise functional parts and long-term use
• Compatible with most FDM printers equipped with a suitable hotend
• Printing in an enclosed 3D printer recommended by the manufacturer

High heat resistance after annealing

After properly performed annealing, the material can achieve heat resistance of up to 194 °C according to the manufacturer. Parts can therefore remain stiff even near motors, electronics, and other heat sources. The specific result depends on the model geometry, print settings, and the subsequent annealing process.

Typical applications

Elegoo PET-CF is particularly suitable for:

• functional and structural prototypes,
• assembly fixtures, templates, and brackets,
• electronics enclosures and parts near heat sources,
• components for robots, drones, and RC models,
• mechanical components requiring high stiffness,
• precise parts used in humid environments,
• small series of functional end-use products.

Printing recommendations

PET-CF contains abrasive carbon fibers, so use a hardened steel, hardened steel, ruby, or tungsten carbide nozzle. A standard brass nozzle may wear out quickly. For reliable flow, a nozzle with a diameter of at least 0.4 mm is suitable; for more demanding models, 0.6 mm is ideal.

To achieve stable results, an enclosed print chamber and an all-metal hotend capable of operating at high temperatures for extended periods are recommended. Although PET-CF has low moisture absorption, we recommend drying it before printing and storing it in a dry box during longer prints. Moist filament may cause cracking during extrusion, an uneven surface, and deterioration of mechanical properties.

Warning: Elegoo PET-CF is a technical PET composite, not ordinary PETG-CF. It requires a higher printing temperature, a suitable hotend, and an abrasion-resistant nozzle.

Key features:

• PET reinforced with short carbon fibers
• High stiffness and mechanical stability
• Low tendency to deform and lift at the corners
• Good dimensional accuracy of functional parts
• Heat resistance of up to 194 °C after proper annealing
• Low moisture absorption
• Professional matte black surface
• Less visible print layers
• Suitable for industrial prototypes, brackets, and fixtures
• Printing in an enclosed chamber recommended