I'm using the print module to convert a node to a PDF. I see that there is the print.tpl.php for theming, but where can I say that I want to show form elements (eg. input fields, radiobuttons, ..) within the PDF?
Not sure if this is exactly what you mean but you can show / hide elements via the ui.
- go to admin/structure/types/manage/your-content-type/display
- Under Custom Display Settings enable Print
This will show or hide form elements for the pdf version as well as the print version.