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Driving a CNC machine directly from an STL file with a DAGU Spider controller

I want to drive a CNC milling machine using only an Arduino processor and an STL file. The STL format was chosen because it is very simple for me to understand and almost all 3D CAD software can export an STL file.

In my forum post here: http://letsmakerobots.com/node/34958 the feedback I go was basically.