Fiberon™ PETG-rCF08

Polymaker’s Fiberon™ PETG-rCF08 delivers an accessible entry point into carbon fiber 3D printing by infusing an easy-to-print PETG polymer base with 8% post-industrial recycled carbon fibers by weight. This sustainable formulation elevates the mechanical stiffness and thermal distortion threshold of standard PETG without sacrificing its user-friendly printing characteristics, excellent chemical resistance, and high impact ductility. Featuring an XY tensile strength of 38.6 MPa and flexural strength of 60.1 MPa, this material significantly mitigates the stringing and warping traditionally associated with PETG. The addition of milled carbon fibers drastically reduces thermal shrinkage, ensuring sharp detail retention, superb z-axis lamination, and a smooth, low-gloss surface finish that conceals layer boundaries effortlessly.

Key Benefits

• Reinforced with 8% recycled carbon fiber for improved stiffness and dimensional stability

• Eco-friendly composition incorporating post-industrial recycled carbon fiber content

• Significantly reduced stringing and oozing compared to standard PETG formulations

• High layer-to-layer bond strength for resilient, crack-resistant functional builds

• Low thermal expansion resulting in minimal warping across large bed contact areas

• Elegant matte black surface finish that hides layer line artifacts cleanly

• High chemical and moisture resistance for versatile indoor and outdoor usage

• Prints reliably on open setups without requiring an actively heated chamber

• Suitable for high-speed printing platforms operating up to 300 mm/s

• No post-print annealing required to attain full mechanical potential

Typical Applications

• Protective electronics enclosures and instrument covers

• Custom manufacturing aids, alignment guides, and assembly templates

• Ergonomic hand tools, grips, and custom handle extensions

• Drone body plates, landing gear components, and camera mounts

• Functional prototypes undergoing iterative mechanical evaluation

• Brackets, structural clips, and general mounting hardware

• Lightweight ducting, airflow nozzles, and fan adapters

• End-use parts exposed to mild chemicals, moisture, or impact dynamics

• Educational and engineering design projects prioritizing sustainability Fiberon™ PETG-rCF08 is ideally suited for makers and engineers looking for an easy-printing, cost-effective carbon fiber composite that delivers high stiffness, low warping, and a professional matte surface without complex chamber management.

Specifications Material: PETG with 8% Recycled Carbon Fiber Filament Diameter: 1.75mm Available Weights: 0.5kg, 3kg Available Colors: Black Density: 1.29 g/cm³ Nozzle Temperature: 240–270°C Build Plate Temperature: 70–80°C Maximum Print Speed: Up to 300 mm/s Cooling Fan: 20–50% Enclosure: Not required (open ambient) Nozzle: 0.4mm or larger hardened steel or ruby nozzle required Drying: 65°C for 6 hours if moisture absorption occurs

Mechanical Properties

• Tensile Strength XY: 38.6 MPa

• Tensile Strength Z: 24.3 MPa

• Elongation at Break XY: 2.9%

• Elongation at Break Z: 1.8%

• Bending Strength XY: 60.1 MPa

• Bending Strength Z: 36.5 MPa

• Bending Modulus XY: 2831.0 MPa

• Young's Modulus XY: 2942.0 MPa

• Young's Modulus Z: 1824.0 MPa

• Charpy Notched XY: 3.8 kJ/m²

Thermal Properties

• Glass Transition Temperature (Tg): 81.0°C

• Vicat Softening Temperature: 83.5°C

• HDT @ 0.45 MPa: 75.8°C

• HDT @ 1.8 MPa: 69.2°C

Recommended Print Settings

• Nozzle: 240–270°C

• Build Plate: 70–80°C

• Print Speed: 30–300 mm/s

• Cooling Fan: 20–50% (lower for max strength, higher for fine overhang detail)

• Retraction Distance: 1–3mm (Direct Drive) / 3–6mm (Bowden)

• Retraction Speed: 30–40 mm/s

• Drying: 65°C for 6 hours if material exhibits stringing or bubbling

• Nozzle: Hardened steel, wear-resistant alloy, or ruby tip (0.4mm or larger)

• Enclosure: Optional; prints reliably in open-air ambient environments Although PETG-rCF08 is less abrasive than higher-percentage carbon composites, the presence of carbon fiber will wear down standard brass nozzles over time. A hardened nozzle is strongly recommended to maintain precise extrusion diameter.