Instructables

CNC machine for shaping large pieces of polystyrene foam

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Step 3: G-code

Picture of G-code
As soon as an STL file is present, G-code can be created. The program I use is called Freemill: http://www.mecsoft.com/freemill.shtml

It is very easy to use, but it could cause some issues with your graphics card. If it locks up, try the following: redo the steps until the last step before it would lock up again. Now shrink the program window or move it off screen, in order to prevent the 3D model from showing on your screen. The program should now work without crashing...
 
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