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Continuous fiber-reinforced composite 3D printing (CFRC 3DP) has become a hot topic of interest for many experts and scholars. Continuous fiber-reinforced prepreg filament (CFRPF) for printing needs to be prepared in advance. In this paper, on the basis of the resin fusion impregnation theory, a fabrication device was designed for continuous carbon fiber-reinforced polycarbonate prepreg filament (CCFRPF). Then, according to the orthogonal test and the TOPSIS entropy weight optimization theory, the optimization method for CFRPF/PC preparation process parameters was proposed, and the relationship between the preparation process parameters and the performance indexes was discussed. The results show that when preparing CCFRPF/PC, the weight of diameter performance index is the largest, about 0.75. The optimal combination of process parameters for CCFRPF/PC is, respectively, 285 °C for the outlet mold temperature, 305 °C for the impregnation mold temperature, and 1 m/min for the winding speed. In this case, the diameter, roundness, minimum curvature radius and tensile strength of 0.375 mm, 29.4 μm, 9.775 mm and 1298 MPa were achieved, respectively. [ABSTRACT FROM AUTHOR]

3D printing of continuous fiber reinforced composites (CFRC) has become a trend. However, the continuous glass fiber reinforced filament (CFRF) is mainly CFRF/PA for 3D printing. there are few studies on CFRF/PLA with PLA as matrix and continuous fiber as reinforcement. In this paper, continuous glass fiber reinforced filament/PLA (CGFRF/PLA) which can be used in 3D printing are prepared by molten impregnation process with PLA as matrix material and continuous glass fiber as reinforcement. Orthogonal experiment method was used to study the process parameters of CGFRF/PLA. The results show that when CGFRF/PLA is prepared, the parameters are set as the cavity die temperature 215 °C, the outlet die temperature 212 °C, the sizing die temperature 202 °C. And the winding speed of the composite material is 7r/min. The diameter of the composite wire we get is 0.45 mm with the roundness error is 0.01 mm. The roughness is 18um, and the bending degree is 25.8 %. At the same time, this study can provide ideas for the preparation of more multiple CFRF. [ABSTRACT FROM AUTHOR]