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3D CAD software is primarily utilized in the planning and design phases of construction and engineering projects, where a three-dimensional representation of a system or structure can be created. This allows different design elements to be visualized and manipulated, which is crucial for detecting interferences between various trades, such as electrical, plumbing, and structural components. By using 3D models, professionals can assess how different systems interact in a physical space, ensuring that there are no conflicts that could arise during installation or construction. This capability helps to streamline the construction process, reduces the risk of costly errors, and enhances collaboration among different disciplines involved in a project.

While preparing cost estimates and managing project timelines are critical tasks in project management, they are not the primary functions of 3D CAD software. Similarly, designing user interfaces falls outside the scope of CAD applications, which are focused more on the physical design aspect rather than software interface design.