Simulations with four formulations show that the paste obtained in the extruder is such that its properties exhibit long-term stabilized values that oscillate periodically. It therefore seemed appropriate to define the values of these properties as an average over the final interval of the simulation time. A comparison of injection scenarios shows that filaments produced by simultaneous injection of AM and BC particles reach the asymptotic state faster and are slightly more homogeneous than the one arising from the sequential injection of AM and BC particles. Furthermore, the simultaneous injection scenario also results in a lower tortuosity factor and higher electrical conductivity of the filament microstructure than the sequential injection.