PET Filament Filled Carbon Fiber15% Carbon Fiber is combined with 85% PET to form a strong filament which has low moisture absorption, high strength, creep resistance, excellent chemical resistance and high heat resistance. Carbon Fiber PET filament has higher rigidity and strength than normal PETG filament. Carbon Fiber Filament - Tangle FreeFull mechanical winding and strict manual examination ensure tangling free and avoid filament breaking and snapping. It is no warpage and no shrinkage and no smell, no heating chamber are required during the printing process.