In the Fused Filament Fabrication (FFF) process, a molten thermoplastic is discharged as a strand through a nozzle. This results in an orientation of non-spherical fillers contained in the polymer matrix in the direction of deposition. The consequence is an anisotropy of the material properties. In terms of the thermal conductivity of such polymer composites, the conductivity within the layers is significantly higher than between the layers. The aim of this study is to investigate the volume flow as a possible influencing factor on the orientation of platelet-shaped thermally conductive fillers in the deposited polymer strands. The focus is on the printing speed during strand deposition and on the strand geometry. By adjusting these parameters, the volumetric polymer discharge and, thus, the material behavior within and shortly after discharge through the nozzle is changed. As an evaluation criterion for the particle orientation, the thermal conductivity of the manufactured specimens is analyzed, which shows a direction-dependent change because of the reorientation of the fillers. For this purpose, a method is used which allows a comparative evaluation of specimens manufactured in the FFF process with Light Flash Analysis (LFA). After manufacturing, also the resulting density of the specimens is determined and compared due to the significant influence on material properties. The measurement results are validated by various methods, such as Computer Tomography (CT) scans or Scanning Electron Microscopy (SEM) images, which document the influence of the parameters on the particle orientation and thermal conductivity. [ABSTRACT FROM AUTHOR]