The article presents a cycloidal gear assembly made of Polyoxymethylene (POM) manufactured using injection molding. The resulting gears were analyzed for processing (technological) defects. It was found that the gears exhibited significant defects, which were a result of processing shrinkage and needed to be eliminated. To address these defects, the injected Polyoxymethylene Tarnoform 300 was modified by adding Molybdenum Disulfide (MoS₂). In the next stage, another injection molding process was carried out using the modified POM polymer. As a result of these changes, a significant improvement in the quality of the internal (driven) gear z₁ = 6 was achieved. Eliminating processing defects from this particular gear (z₁ = 6) is crucial, as the internal gear is subjected to greater loads. The cycloidal gear assembly is a highly non-technological design in terms of injection molding. However, the article demonstrates that it is possible to eliminate processing defects even in such complex designs.