• at the extrusion temperature, BC particles are in a pseudo-molten state. We use granular solid particles that allow overlap and set the cohesion force on their interaction surface to mimic highly viscous fluid; • the model does not include temperature parameters, so the effects of extruder temperature or filament cooling under ambient conditions on the filament are not considered. However, cohesion and resistance coefficients are set to simulate the physical state of the materials above the melting point; • the values used to calculate material properties such as density, Young modulus, and