ProductPrint Demo
The Print button is added to the single product page. Once you're on any single product page, you'll see the button.
You can tailor both the button text and the icon within the button. You also have fine control over the position of the button, to help it fit perfectly with your theme.
Click the button and a print dialogue will open in a new window.
Click print on the print dialogue to send the document to your printer. If you wish to generate a pdf, you'll find most broswers offer you that option within the print dialog box.