PDF - Thin White Lines Present

Hi there,
When I "print" as a PDF file from my .ai file, thin white lines appear in the PDF where frame edges would normally be invisible.
Is there a way to create the PDF without this happening? And, why is this happening?
If this has something to do with not flattening my artwork before I create a PDF, then how do I do that?
Thank you!

You are giving him a PDF file.
The problem is that he is literally ruining the content of the file by converting the PDF file to a raster image in Photoshop and then printing that, in other words it looks like your printer is using Photoshop as a “poor man's RIP!” The transparency effects in your PDF/X-4 file are being flattened at whatever resolution your printer sets the Photoshop image to be. In fact, transparency blending should be performed at the printer's RIP where such flattening artifacts that you are seeing are avoided.
You say you don't have your choice of printer?
Would you say you don't have your choice of physician if a doctor told you he was going to do an appendectomy by operating through your nose? Would you claim you don't have your choice of physician?
Professional incompetence is professional incompetence. If you have a “printer” who is really printing PDF files by opening them in Photoshop and printing directly from Photoshop to the device somehow, you are dealing with demonstrable incompetence!
The advice to find another printer is the best advice that we (including Adobe) can provide to you!
          - Dov

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