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Mike
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Possibly the post-processor you got from the forum was made to save inch files and your file being in mm, caused the limits of your machine to be exceeded. For every mm it should be going it would actually be moving an inch so all the lengths would be longer than you expected.

G20 is for cutting in inches, G21 is for cutting in mm. Make sure your cut file contains the correct gcode for the file to cut correctly.
 
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