3D CAD systems:
These are supported by a form of independent installation that includes, in addition to calculations, the respective parametric models and interface between Excel and the respective 3D CAD system. An assembly may consist of not only individual components but also groups of components (sub-assemblies). For example, you can insert one complete solution of a belt gear at once, which is fully associative, and the dimensions of the inserted component (sub-assembly) will change automatically in case you make changes to the calculation parameters later.
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