<?php
// print.module
function print_menu()
{
    $items  = array();

    $items['print/%node']   = array(
        'title' => '',
        'access arguments' => array('access content'),
        'page arguments' => array(1),
        'page callback' => 'print_process_print',
    );

    return $items;
}

function print_process_print(&$vars)
{
    error_log(__FUNCTION__.' called');
    error_log('node: '.var_export($vars, true));

    $vars['theme_hook_suggestions'][]  = 'html__print';

}