COCOON PET-Cactus(HTCF) is a carbon fiber reinforced, heat-resistant material, offering an "enhanced, heat-resistant" solution for 3D printed PET. It boasts a heat deflection temperature of up to 200°C without the need for annealing or waiting. This material also exhibits high heat resistance, high strength, high stiffness, and high creep resistance, along with good fluidity and stable extrusion performance. The printed products have a matte and sand-like smooth surface, with high heat resistance and mechanical strength. They are waterproof, have excellent chemical resistance, and combine outstanding mechanical properties with good dimensional stability, making them widely applicable in functional components, load-bearing structures, and auxiliary tooling fixtures for 3D printing scenarios involving long-term loads.