Look for deep blade grooves, uneven channels, rough lower edges, paper tags, and bottom sheets that remain partly attached. Wear may be concentrated in the area used for smaller repeated cuts, so inspect the entire length rather than only the centre. A dull blade or incorrect depth can produce similar symptoms, which means both components should be assessed. Follow the cutter instructions before accessing the stick or knife area. If the part provides several usable surfaces, rotation may restore a clean landing area for the blade. Once every permitted surface is deeply marked or damaged, replacement is needed to maintain complete cuts and reduce unnecessary blade wear.