<p>The rising global energy demand and reliance on fossil fuels have created a pressing need for renewable energy systems supported by advanced, cost-effective energy storage technologies. This study explores the use of 3D printing to fabricate stainless steel-based electrodes for energy storage devices. A composite filament containing 17-4PH stainless steel powders and a polymer was processed via fused deposition modelling (FDM) and subjected to direct thermal treatment. While the polymer was removed during heating, oxidation rendered the stainless steel non-conductive. To address this, the 3D-printed parts were sintered in a graphite atmosphere, reducing oxidation and improving conductivity. Electrodes were sintered at 400, 450, and 500 °C with and without graphite, and their structural, compositional and electrochemical performance were analyzed. Combined XRD, FTIR, and EDS analyses indicated that graphite-assisted sintered electrodes contain chromium-based oxides, while those without graphite assistance samples mainly exhibit iron oxides. Graphite-assisted sintering at elevated temperatures produced a denser and more conductive structure, delivering an areal capacitance of 131 mF cm⁻² at a scan rate of 10 mV s⁻¹, whereas untreated specimens exhibited negligible electrochemical performance. This study demonstrates the potential of 3D printing as a cost-effective method for fabricating electrodes for energy storage applications.</p>