Neje 2S engraving

Dear All I’m using Neje Master 2S Plus, A40640. I noticed that when I’m doing engraving work and when the engraving result is not good enough I re-start engraving again the same thing. In this case I was engraving Alpha Numeric letters. The end result is engraving is slightly out from the same spot. If I repeat the same thing twice I will see additional engraving lines Is this due to the rubber belt being loose and need re tightening. Thank you.

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