Filter in Jira stories you wanted to print. For example: do a search as "sprint=1" to get all stories from your sprint #1. Then, export them as XML or Excel (All fields) format.
To upload your file, select your Jira file into the above form and click on the "Convert" button. Only XML or Excel file with a size below 1MB are supported.
When the processing will be done, your stories will be downloaded automaticaly as a PDF file