<![CDATA[In the Industry 4.0 era, reducing hidden waste is a major challenge to improve operational efficiency in the manufacturing industry. This research is an innovation of "Shadow Core" that integrates the concept of shadow board and toolbox with a cluster-based grouping system. Shadow Core is designed to overcome the weaknesses of conventional methods in operator tool management which often cause wasted tool search time and machine downtime. Through a Research and Development (R&D) approach with a 3D model (Define, Design, Development), the Shadow Core prototype was tested in an industrial environment for one month. The results showed a significant increase in efficiency with a decrease in tool search time per case by up to 90% and total search time per day by 75%. The application of Shadow Core has proven to be an effective solution to eliminate hidden waste, increase operational productivity, and contribute to the development of a more efficient tool management system in the manufacturing sector.]]>
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