This work presents the complete design and implementation process of a custom outlet cover for an open turbine within an irrigation system, aimed at improving water management after electricity generation. The objective was to develop a tailored component capable of efficiently redirecting the outgoing water flow, minimizing turbulence and pressure losses, and maintaining system stability. The design methodology integrated graphical engineering tools throughout all stages: from 2D technical schematics to 3D CAD modeling, leading to an optimized geometry compatible with the turbine structure. The finalized model was manufactured using additive manufacturing technologies, employing a sustainable PLA-based filament selected for its mechanical performance and environmental benefits. The printing process ensured dimensional accuracy, structural integrity, and a watertight seal between the cover and the turbine outlet. Once installed, the component was field-tested in a real irrigation environment. Results showed that the 3D-printed cover effectively guided water discharge without leakage, maintaining stable hydraulic behavior while withstanding mechanical loads from continuous operation. The component‘s success confirms the technical viability of digital design workflows and additive manufacturing for customized hydraulic applications. This study highlights the potential of graphical methodologies and sustainable materials in the development of site-specific solutions in rural infrastructure, opening paths for low-cost and adaptable fabrication of hydropower-related elements.