This is the reason that the overall dimensions are show when a file is being opened- so that you have some way to confirm that the overall scale is correct. The STL format provides no information about the units or scale so MeshCAM has to rely on you clicking “Inch” or “MM” when you load the file. Many of the high-end CAD programs, like Solidworks, Inventor, or Pro-E, will save STL files scaled for units that might be different than the file that produced them. When this happens, it’s usually off by a factor of 25.4, a clear tipoff that it’s an inch/mm problem. It’s not unusual for new users to load an STL file and find that the size is off by a bunch.
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