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Continuous glass fiber reinforced polylactic acid (CGF/PLA) composites were prepared by 3D printing technology in this study. The multi-roll melt impregnation mold was manufactured according to the melt impregnation model. CGF/PLA filament was prepared by a melt impregnation device, and then used to prepare CGF/PLA composite materials by the self-modified 3D printer device. The full impregnation of the fibers was achieved by the action of the coverage angle of the tension roller in the impregnation mold. The effects of the total coverage angle, traction speed, fiber content, and impregnation temperature on the fiber impregnation effect and 3D printed product performance were studied. The bending strength, tensile strength, impact strength, and interlayer shear strength of the printed sample reached 312, 220, 154, and 14 MPa, respectively. The strategy in this study can effectively improve the impregnation effect of PLA resin on CGFs and promote the development and application of 3D printing technology in the field of high-performance composite manufacturing.

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A dual-nozzle 3D printing technique was proposed to prepare continuous glass fiber reinforced PA6 (CGF/PA6) composites with sandwich structure. Short glass fiber reinforced PA6 filament was used for printing the surface layer and CGF/PA6 filament was used for inner part to provide high-mechanical performance. Morphology of CGF/PA6 filament and the properties of printed composites samples were investigated. Printing process parameters were systematically optimized. The results showed that when CGF/PA6 part thickness of the composites samples was 2.8 mm, the flexural strength and flexural modulus, notched impact strength and interlaminar shear strength of the printed products can reach 275.4 MPa, 10.8 GPa, 168.2 kJ/m 2 , and 26.5 MPa, respectively. The dual-nozzle 3D printing strategy in this work was of great significance for the precision fabrication of continuous fiber reinforced thermoplastic composites (CFRTPC), which can be widely used in aerospace, automotive, wind turbine blades, shipbuilding, and other industrial fields due to their excellent mechanical properties and ability to resist vibration and corrosion.

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