COCOON PETG-Birch (CF) is a PETG chopped carbon fiber composite filament that effectively reduces nozzle clogging, offers high strength and modulus, and is easy to print. The printed products have a glossy surface with hidden layer lines, and are resistant to yellowing, chemical corrosion, durable, environmentally friendly, and odorless. It supports open printing and achieves a precise balance of mechanical properties, printing performance, and surface quality. It is suitable for applications requiring high load-bearing capacity and rigidity, such as tooling fixtures, precision instrument housings, and structural components.