You can try using the PrintFriendly & PDF module, which has a version for Drupal 7 and one for Drupal 8. (The development snapshot for Drupal 8 has been created on July 27, 2017.)
The description of the module says:
The #1 Print and PDF button for your Drupal site. Printer Friendly
pages without coding, css, or print.css. Fast, easy, and professional.
The Print Friendly & PDF button saves paper and ink when printing or
creating a PDF. It's fast, easy, and looks great when printed. Add the
button now, and your users will see the difference.
Using this module you can add a print button to review order pages.