In order to improve the impregnation ability of resin to fiber in continuous fiber reinforced thermoplastic composites (CFRTPCs) 3D printing technology and realize good impregnation interface bonding performance

a new technology of continuous fiber reinforced thermoplastic composite pre-impregnation 3D printing was proposed. The 1K carbon fiber reinforced nylon (CCF/PA12) re–impregnation filament was prepared using the self-developed meltimpregnation fiber pretreatment equipment

and then used for the 3D printed composites as raw material. The effects of key process parameters during impregnation and 3D printing were studied. The results show that the ultimate tensile force and tensile strength for fully impregneted prepreg filaments are 118.2N and 813.9MPa respectively. When the scanning spacing is 1.5mm

the delamination thickness is 0.1mm

the tensile strength and modulus of 1K–CCF/PA12 composites are 558MPa and 56GPa respectively. The porosity of the composites measured by micro X–ray 3D imaging system is about 0.15%. The [0/45/90/–45]10 laminates improve the impact resistance and can achieve the peak load of about 4.63kN.