Get a different printer. Flattening layers has nothing to do with perceived lines in the artwork. At a minimum you should be supplying them with a PDF saved to PDFX1a standards. Get a better description of what they can work with.
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Get a different printer. Flattening layers has nothing to do with perceived lines in the artwork. At a minimum you should be supplying them with a PDF saved to PDFX1a standards. Get a better description of what they can work with.