It is only the manufacturing accuracy level of the blade is different, and the mggn is smaller than the mgmn shape error. That is to say, in the same situation, when changing the blade, always use a blade, the blade of mggn probably retracts 0.05mm, and mgmn may have to be 0.1-0.2mm. Of course, it depends on the material you wear and the wear of the blade.
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