this post was submitted on 31 Mar 2025
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I suspect in that context it was meant to see the alignment of the devices used to make the cartons-- you print the cross-hairs in all four colours and make sure that they line up neatly, or that they're positioned exactly where a fold or cut is supposed to be made, so you can easily detect when the process is out of alignment and how. Here it's a clear signal the process is out of alignment.