Bambu Lab PET CF

Bambu Lab PET-CF Carbon Fibre Filament — 1.75mm, 1kg

PET-CF is Bambu Lab's carbon-fibre reinforced PET engineering filament. Chopped carbon fibre is blended into a tough PET base, which lifts stiffness, strength and heat resistance well above everyday PLA or PETG while keeping PET's low shrinkage and low warping. The result is a filament that holds its shape under load and at elevated temperatures, with a soft matte carbon finish straight off the plate.

It's aimed at makers, workshops, engineering students and small businesses printing parts that actually have to do a job: brackets, jigs and fixtures, drone and RC frames, tool mounts, automotive and under-bonnet trim pieces, robotics arms and structural housings. If you've been reaching for PETG and finding it too soft or too heat-sensitive, PET-CF is the logical step up. It runs on enclosed, high-temperature capable printers — Bambu Lab X1 series, P1 series and compatible third-party machines — and requires a hardened steel nozzle.

Key Features

Carbon fibre reinforced
High stiffness & strength
Excellent heat resistance
Low warping & shrinkage
Matte carbon finish
±0.03mm tolerance
AMS compatible
Annealable for extra strength

Print Settings

• Nozzle temperature: 260–300°C
• Bed temperature: 70–100°C (80°C is a reliable starting point on smooth or textured PEI)
• Print speed: keep under 100 mm/s — slower flow gives noticeably better layer bonding
• Part cooling fan: 0–40% only; too much cooling weakens layer adhesion
• Nozzle: hardened steel required (carbon fibre is abrasive), 0.6 mm recommended
• Enclosure: recommended — a stable chamber temperature reduces warping on tall parts
• Drying before use: 80°C for 8–12 hours in a filament dryer or blast oven, or 90–100°C for 12 hours on an X1 series heatbed
• Optional annealing: 80–140°C for 6–12 hours to further raise strength and heat resistance

Specifications

Available Colours

Choose your colour from the dropdown above. Every colour shares the same specifications and print settings:

Black (71100)

Practical Tips

Dry it, then keep it dry. PET-CF absorbs moisture quickly, and wet filament is the number one cause of stringing, popping sounds during extrusion, brittle parts and poor layer adhesion. Dry a fresh spool before its first print, run it from a dryer or an AMS with fresh desiccant during long jobs, and store it sealed with desiccant between prints — particularly through a humid Australian summer.

Set the printer up for abrasive filament. Fit a hardened steel nozzle before your first PET-CF print — a brass nozzle will wear out fast and quietly ruin your dimensional accuracy. Keep part cooling low, print slowly on the first layer, and if a part will see real load or heat, anneal it at 80–140°C for 6–12 hours to squeeze out the last of its strength and heat resistance. Expect a small amount of shrinkage after annealing, so test-fit critical tolerances first.