By Renexor — Your Printer’s Smartest Friend | Toner Cartridge Depot Quick answer: If the same dot, streak, or smudge repeats down your page at an even interval, a rotating part is damaged — and the distance between two identical marks equals that part’s circumference. Measure it in millimeters. On many HP and Canon engines,… Continue reading Repeating Marks on Every Page? Measure the Gap — Your Printer Just Told You Which Part Failed