Parametrics serve two main functions. One, they allow napkin-aided design because you can always easily adapt the parts as the design evolves. They are also great for using a single drawing to represent a family of similar parts. Join the 3D world I hope this article has piqued your interest in solid modeling. If you are into mechanical design, you should be taking a serious look at one of the parametric solid modelers.
Parametric modelers are the epitome of editability.
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