A TiO2-PP-granulate-mixture was fed to an extruder EX2 (Filabot) and extruded at 210 °C into an attached water bath. After cooling in water, the extrudates were dried and granulated using the 'SHR3D IT' shredder (3devo). The TiO2-PP-granulate was then transferred to the material shaft of the Composer Series 350 filament extruder (3devo). After reaching target temperatures, the extrusion process was activated. The filament diameter was monitored by an optical sensor. All filaments were spooled onto empty plastic rolls. The process was stopped after reaching the targeted total filament mass.