Introduction: The "Ghost" in Your Machine You set up the machine, calibrate the printer, and the first 10 bags look perfect. But by bag #50, the barcode has drifted off the edge. You recalibrate, but it happens again 10 minutes later.The problem isn't your printer sensor—it's likely your bag's Eye-Mark (Registration Mark) . In high-speed "Next-Bag-Out" printing, a variation of just 1mm  per bag accumulates. Over a roll of 2,000 bags, that drift causes massive failure. 1. What