Physical CAD models materials. They bend, cut and crack like real materials, while you are designing, so the shape you design is suitable to the material.
Active materials are most useful when making things, but makers are usually not expert CAD users. Physical CAD lets makers contribute their expertise by simulating realistic tools.
Something special emerges: when you design a shape using accurate tools and materials, you are also designing a manufacturing process that can be used to make it.

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