Worth a mention-

Turn complex 3 or 4 axis jobs into parts in minutes with ProtoWizard. ProtoWizard is driven by 3D STL files generated by any of your favorite CAD systems. Simply import the STL file or files of your design, select a roughing and finishing tool, and in minutes you have the G Code file for any of the most popular CNC Milling machines.

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online demo- http://www.excaliburcnc.com/pwring_demo.html