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i would suggest that there are 2 factors- speed and sharpness of the trimmer. Using a diamond credid card sharpener made a huge difference on mine.


the tool is rubbing on the end of the blank causing friction- the higher the speed the more generated in a given time and ultimately burning. If it is blunt instead of cutting, it is causing more friction, same result.


You will get the same if you use a sander and a fine grit paper.


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