The participants researched applications of 3D printing and proposed using it to create a model of a stadium construction project. They first planned to design a stadium with each phase represented by height increases. However, they changed the proposal to a terrain model containing a stadium, solar-panel parking lot, condos, and surrounding fence, each with varying heights. They encountered obstacles in design and printing but overcame them. The project gave the participants hands-on experience with 3D modeling software and an understanding of 3D printing applications in various industries.