Circular production plays a crucial role in the transformation towards sustainable economic systems by conserving resources, reducing waste, and extending the lifecycle of materials. This contribution demonstrates how circular production processes can be illustrated using a learning environment for recycling 3D prints. The implemented concept allows insights both into technical and economic-ecological challenges. Technically, the demonstrator represents the process chain for producing new filament from 3D printing waste, support structures, and obsolete 3D prints. This allows students to experience the technical complexity and challenges of circular economy concepts firsthand. Furthermore, the learning environment offers the opportunity to investigate and optimize ecological-economic aspects such as the carbon footprint, the business model or the economic efficiency of the production process. To gain a comprehensive overview of the multiple influencing factors and dependencies, a System Dynamics model was created. This model also allows for the simulation of changing scenarios. By combining hands-on experiences with theoretical concepts, this approach promotes a deep understanding of the principles and typical challenges of circular production process, and the circular economy in general.