Purpose: This study aims to develop and prove a Lean training simulation in a manufacturing setting with the purpose of deploying it to a university classroom in the future. Design/Methodology/Approach: The study employs Simulation to simulate a production facility operating without the use of Lean tools as a “before” process. With the introduction of tools such as standard work, level loading, kanban, just-in-time, and visual management, a new “after” scenario is proposed and evaluated. Findings/Outcomes: The findings demonstrate how the use of Lean tools can help stabilise the production process and deliver superior results in terms of quality and output. The study demonstrated the level of understanding achieved by the learner through hands-on Simulation versus purely theory-based learning of Lean. Research Limitations/Implications: The study is specific to one example of a representative mechanical assembly process from a multinational manufacturer in the west of Ireland, reproduced in a classroom training setting. However, this study has implications for academic and teaching applications in the future with controlled measures and assessment of learning outcomes achieved and student experience. Originality/Value: The study is one of the first in an Irish university to use Simulation to demonstrate the benefits of Lean in the manufacturing classroom environment before transferring to the university classroom and can be leveraged by other Lean academics as well as industry practitioners. The study brings a practical application of Lean concepts to the learners. It creates an immersive experience in which they can better understand the concepts of Lean in a simulated production environment.