Show PDF/print icons inside a template file
As the README.txt says  


  Administration > Structure > Content types (admin/structure/types)
  For each content type it is possible to enable or disable the
  PF link via the "Show printer-friendly version link"
  checkbox. (default: enabled) It is also possible to
  enable or disable the PF link in individual comments via the
  "Show printer-friendly version link in individual comments"
  checkbox. (default: disabled)


API

print_insert_link(), print_mail_insert_link(), print_pdf_insert_link()



  The *_insert_link functions are available to content developers that
  prefer to place the printer-friendly link in a custom location. It is
  advisable to disable the regular Printer-friendly link so that it is
  not shown in both locations.


Take a look at THEMEABLE FUNCTIONS

It is a best Practice to read modules README.txt.