Enhancing Production Quality and Sustainability in Aluminum-Based MSMEs Through Defect Reduction Using Six Sigma MethodologyMuhammad Faishal, Arif Kurniawan, Hayati Mukti Asih and Endah UtamiE3S Web Conf., 622 (2025) 01017DOI: https://doi.org/10.1051/e3sconf/202562201017