I can suggest a workaround, and there are probably a multitude of ways you can get around it, but this is my personal favourite. From the print dialog, select 'Open PDF in Preview' from the PDF dropdown menu (bottom left). When it does open in Preview, use the select tool to select and crop to your heart's delight.
With this method, in Preview, after making a selection, you can crop the area from the 'Tools' menu. The keyboard shortcut for the menu-item is Cmd+K. Hope that helps.
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How to print PART of a web page?
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