Depends on the material your cutting OR there is a little white plastic strip on most plotters. If you have miss-aligned your vinyl enough times your blade with chew that strip up causeing your blade to dull and also won't cut your vinyl but more or less preferate it making it hard to weed.
Another thing to check is your pressure your cutting at or speed. I'm nit sure exactly what plotter you have but those would be my guesses.
Another thing to check is your pressure your cutting at or speed. I'm nit sure exactly what plotter you have but those would be my guesses.