The mechanical properties of 3D-printed composites are crucial for FEA simulations and analyses of high-speed impact, crashworthiness, shock and blast mitigations. In these simulations, quasi-static properties are insufficient to accurately predict the results, as these materials are subjected to large deformations and have different sensitivities to strain rates. Therefore, the present study focussed on performing dynamic testing at high strain rates on 3D-printed composites fabricated using continuous carbon fibre reinforced with nylon-based ONYX matrix. Nine specimens were printed and tested utilizing the Split-Hopkinson Pressure Bar (SHPB). The true stress and strain properties and the failure patterns were evaluated. Furthermore, these experimental cases were numerically modelled using an explicit finite element solver, viz. LS-DYNA. It was found that the numerical results were consistent with the corresponding test results, including stress–strain plots and failure patterns.