Vector Art 3D

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"VA3D-Machinist is a powerful but easy to use software solution for carving 3D CNC Clipart. It will let you take "V3M" models, purchased from the Vector Art 3D website and in just a few minutes create toolpaths to efficiently cut them on your CNC machine."
There are a couple free samples there
Works well with Mach3
www.vectorart3d.com/machinist_free/ (http://www.vectorart3d.com/machinist_free/)