This article explores the application of Fused Deposition Modeling (FDM) technology using polylactic acid (PLA) for the fabrication of sacrificial patterns within the investment casting process (Lost Pattern Casting). A comprehensive assessment was carried out on the mechanical properties and dimensional accuracy of castings made from AL9-1 aluminum alloy. 3D-printed models served as expendable patterns for creating gypsum-based ceramic molds. The geometric accuracy, surface roughness, and mechanical properties of the alloy after casting were evaluated. It was determined that the proposed approach enables dimensional tolerances of up to ±0.2 mm and surface roughness of approximately Ra ≈ 12 µm, without the formation of cracks in the mold. The results confirm the feasibility of using FDM printing in foundry technology for the production of small-batch and prototype parts.

FDM, investment casting, gypsum mold

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