This study examines how Fused Filament Fabrication (FFF) process parameters affect the mechanical properties of sintered 17-4PH stainless steel. Test specimens were printed from BASF Ultrafuse 17-4PH filament on an IDEX system and processed by industrial debinding and sintering. The effects of layer height, printing speed and infill angle were evaluated through tensile testing. The highest tensile strength of 802 MPa was achieved at 0.2 mm layer height, 25 mm/s printing speed and 45° infill orientation. Layer height showed the dominant influence on tensile strength, as later confirmed by ANOVA, while printing speed and infill angle had smaller or non-significant effects within the tested range. The results give a practical understanding of how printing parameters determine the mechanical behavior of 17-4PH parts and can support further optimization of metal FFF processes.
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