Cannot get dompdf to work
Print module works best when you copy the library dompdf (or tcpdf) to the module folder directly. In this was you don't need to edit the file, and the print module will detect the library automatically.


Extract the dompdf directory into sites/all/modules/print so that you have dompdf_config.inc at sites/all/modules/print/dompdf/dompdf_config.inc.
Ensure that you have write access to PUBLIC/print_pdf/dompdf/fonts directory.
Your print module should now show the detection of the library at admin/config/user-interface/print/pdf.

You should now be able to export the nodes to PDF :)