Preparation of a TiO2-PP -mixture 3D prints from PP were shredded and granulated using the 'SHR3D IT' shredder (3devo). Every batch was recycled three times to the device and after granulation stored in air-tight plastic bags. Defined mixtures of PP-granulate and Aeroxide P25 (ACROS Organics) were provided in a 5 L beaker and mixed by hand using a spatula.