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when I convert the cero drawing to pdf the thicknesss of the line come heavy how to reduce the line weight
Take a look as some of the links in this post and see if they answer you question:
https://community.ptc.com/t5/Creo-Modeling-Questions/Creo-2-0-line-weights-in-drawing-dont-match-PDF/m-p/302610#M76599
