Project Introduction: This project aims to directly 3D print high-performance composite material parts reinforced with continuous fibers and based on thermoplastic polymers. Using continuous fibers and thermoplastic polymers as raw materials, the composite immersion-fusion deposition 3D printing process is employed to achieve low-cost, integrated, and rapid manufacturing of complex structural composite components. Compared to existing composite manufacturing technologies such as autoclave molding technology, transfer molding (RTM) technology, winding molding technology, and automatic laying-up technology, the main advantages of the composite 3D printing process lie in its low cost and short cycle, enabling the rapid manufacturing of complex structural composite material components. Innovation: 1. Desktop Continuous Fiber Reinforced Composite (CFRC) 3D Printer: The team independently developed a desktop CFRC 3D printer, which produced Cf/PLA composite materials with a bending strength of 390MPa, seven times that of traditional PLA parts (48-53MPa), and its performance is comparable to aluminum alloy, with a weight reduction of two-fifths. 2. Large-Size High-Speed and High-Stability Continuous Fiber Composite 3D Printer: The team independently developed a high-speed printing head system, utilizing a dual-head printing mode. One head is used for the composite printing of dry fiber filaments, while the other head prints support and auxiliary materials. It also features an online cutting-and-continuing function for continuous fibers, enabling the integrated rapid manufacturing of complex components from high-performance composites. 3. Integrated Manufacturing Technology for Lightweight Structures of Composite Materials The team proposed an integrated manufacturing process for lightweight structures based on continuous fiber-reinforced composite materials. The prepared continuous aramid fiber reinforced PLA composite material lightweight structure achieved a compressive strength of 17MPa when the fiber content reached 11%, which is superior to the corrugated lightweight structures produced by traditional manufacturing methods. 4. Efficient Electromagnetic Shielding Composite Material Controlled Manufacturing Technology The electromagnetic shielding effectiveness, bending strength, and tensile strength of the prepared material reached 75.6dB, 105MPa respectively. 5. Selective Laser Sintering Forming of Short-Cut Carbon Fiber Reinforced Composite Material Components Selective laser sintering uses a CO2 laser as the heat source and composite powder of reinforcing fibers with polymers as the raw material to complete the 3D printing of fiber-reinforced engineering plastic composites.