In the sequential injection scenario (see Fig. ), simulations with 500 rpm and 2500 rpm are close to a plateau after 30 M 𝛥𝑡, but it does not mean that they reached a steady state. The videos in the SI demonstrate that the extruder continuously propels particles into the recirculation circuit, where they are gradually reintroduced through the extruder's side inlet. In the 500 rpm simulation, we tagged several AM particles which are the first output from the extruder, as can be seen in SI video. We found that, until the end of the simulation, they only passed through the recirculation circuit and returned to the extruder once, without fully completing a second recirculation. Since the rotation speed is too slow, the completion of the second and subsequent recirculation requires a longer simulation time, and the computational costs are too large to be able to realize them, so we did not simulate for longer times. We performed the same operation in a 2500 rpm simulation, and the tagged AM particles passed through the recirculation circuit much faster. However, when the AM particles reach the end of the extruder barrel, where the extruder outlet narrows rapidly, the particles are stuck in the nozzle. Also, the corner not far from the nozzle makes it more difficult for the particles to pass through. This phenomenon occurs because the power generated by the rotation of the twin-screw is insufficient to keep the particles in motion. The first few particles to leave the extruder re-entered through the recirculation circuit and gradually gathered at the end of the extruder barrel, and the blockage had still not been lifted by the end of the simulation. In the 5000 rpm simulation, the tagged particles completed the mixing process several times and were eventually distributed all over the system without particle blockage.