Method 1: Make sure the blade holder isn’t faulty. The spinning blade can become caught or snagged if the holder isn’t gripping properly.
Method 2: Examine the pinch rollers. Make sure that they are locked down and firmly pressing down when the plotter is operating. If the pinch rollers are faulty, it can cause the film to move during the cutting process, creating marks and imperfections.
Method 3: Make sure the tension wire is tight. Test the plotter for correct tension by cutting small circles in the film. If the circle arcs seem lopsided or don’t line up correctly, something is loose.