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Now since you mention print button and the PDF I presume that you want to have a print button and that you have set up your system to allow you to select if you want it to make the print over the printer or to dump it all into a file instead.
Based on that, I would advise to take a look at the following guide: Print Button on Forms
If you have any questions of course, feel free to let us know and we would be happy to answer them for you.