The 3D assembly is one of the common methods or technology used by computer-aided design and product visualization software system which handle multiple files that represent components of the product. Part modelling refers to basic design concepts and procedures which must be known before any part is built. Part modelling shows how a 2D or 3D conceptual layout is drafted, precise geometry creation using basic geometric entities and dimensions, etc.

Using part modelling, the conceptual sketch through solid feature-based modelling a part can be build or modified through direct or intuitive graphical manipulations. It shows how to draft a 3D conceptual layout is drafted; how precise geometry is created using geometric entities.

3D assembly helps in creating precise geometry, robust engineering features can be quickly built, modeling performance is smarter and faster, also detects static and dynamic interference. The large assemblies can be quickly loaded with lightweight representations. Accurate model representations will be the result.

The 3D assembly involves many numbers of parts depending on the size of the design. This needs to be well-taken care of as the original part file ever be broken or files should not be missing etc. The connectivity of each part is so crucial to make perfect design assembly.  The conceptual or geometric entities usage, the techniques, or methods involved in the creation of modeling or assembling will be documented perfectly to make the mechanism well understood by the people. The 3D assembly concept allows a set of pieces that work together as a mechanism and part modeling will be the fraction of the whole. Different parts of modeling is assembled to form the final 3D product.

In the present situation, various 3D assembly or part modeling software or techniques or methodologies are available. These are developed with robust engineering practices so that every detailing can be easily maintained. The different parts modeling of design makes the final 3D assembly well detailed apt to the requirement specification.