Printing an order page
You might want to produce a printed copy of an order for your own records, or to include in the package when you ship your order to a customer. You can print an order directly from your Shopify admin, but you can't print draft orders.
When you print an order page, the printed page includes the Timeline comments for that order.
To print custom invoices, packing slips, or other documents, consider downloading the Shopify Order Printer app from the Shopify App Store.
Steps:
From your Shopify admin, go to Orders.
Click the order that you want to print.
Click More actions, and then click Print order page.
In the print options window, select your printer and settings, and then click Print.