Print A Different Page in WordPress

Step 1: For print button use a link with variable ?pfstyle=wp. Use any text or graphic you'd like (printfriendly.com/button)

<a href="/my-site/example-page.php?pfstyle=wp" rel="nofollow">Print</a>
 

Step 2: On destination page, include the JavaScript just above </body>  
 

<script type="text/javascript">

// PrintFriendly

var e = document.createElement('script'); e.type="text/javascript"; e.async = true; 

e.src = '//cdn.printfriendly.com/printfriendly.js';

document.getElementsByTagName('head')[0].appendChild(e);

</script>