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The article focuses on the mechanical properties of mould parts created using 3D printing technology, for use in the production of castings by High-Pressure Die Casting (HPDC). The mould shapes produced by 3D printing technology bring innovative approaches to optimising production processes. H13 tool steel is widely used for its excellent mechanical properties and resistance to thermal stress. The study focuses on the comparison of the mechanical properties of mould parts produced by traditional methods and 3D printing, with emphasis on their strength, hardness and wear resistance under repeated working cycles. The experimental part includes roughness measurements and tests of mechanical properties, which provide important data on the ability of these components to withstand high mechanical loads and temperature fluctuations during the HPDC process. The results of the study show the advantages and limitations of 3D printing compared to traditional manufacturing processes and give insight into the use of additive technologies in industrial manufacturing. Specifically, the study identified clear quantitative differences in mechanical properties: the 3D printed mould parts had comparable ultimate tensile strength and yield strength to conventionally manufactured parts, but significantly lower ductility (below 1% compared to about 20% in traditional parts) due to higher porosity (0.25–0.30% compared to 0.03–0.04%). Additive mould parts exhibited higher hardness (approximately 510 HV) compared to conventional parts (approximately 450 HV). Surface roughness of the 3D printed parts was more variable, highlighting the need for optimising printing parameters. Thus, additive technology offers benefits in stable hardness and comparable strength, albeit at the expense of reduced ductility and increased variability in surface quality. The research also includes an analysis of the effect of repetitive loading on the mechanical properties of the mould parts made of H13, which provides valuable information for improving their durability and reliability in practice. This research contributes to the development of 3D printing technologies in the field of HPDC and offers new opportunities for improving the efficiency and quality of manufacturing processes in industrial applications.