The model consists of the geometry of the extruder and the material particles used to form the filaments. The extruder in this model contains a twin-screw, an extruder barrel and a recirculation circuit (made of a simple pipe). It was digitally reconstructed from the machine used in the experimental study to maintain geometric similarity and proportionally scaled down to balance computational cost. In addition, the model abstracts two types of spherical particles based on the experimental study. We set the material properties to represent the different material aggregates.