<p>This article explores the implementation of elliptical pins in cycloidal pin gear transmissions, a modification aimed at enhancing their performance characteristics. Traditional cycloidal drives utilize circular pins, but this study investigates the potential benefits of using elliptical pins, including reduced contact stress and improved lifespan of the transmission components. A new calculation method is proposed for determining the profile, curvature, forces, and stresses in both epicycloidal and hypocycloidal gears with elliptical pins. This method was used to optimize parameters of an example gear. The study demonstrates that elliptical pins can reduce the equivalent curvature and contact stress in the transmission. This reduction of stress is small (up to 13% for gears in the paper), but it should not be neglected as it can significantly increase the lifespan of the transmission. Finite element analysis showed that the reduction can be even greater. Also, the occurrence of undercutting in hypocycloidal gears was investigated. Additionally, the design of the prototype of a 2K-V epicycloidal reducer with elliptical pins suitable for 3D printing, is considered.</p>