You can use the Better PDF Exporter app to compile PDFs from the portfolio items. You can use your own export templates and easily print the result.
(Disclaimer: it is a paid app developed by our team.)
Right now you will need to use your browser print function to create the a PDF or print the report. The JIRA report pages are developed in a way that can be printed from the browser. There is also a request for implementing a specific feature for that, but right now this is not present in Portfolio.
Please take a look at this answer (https://answers.atlassian.com/questions/11437346) which has more detailed information about this.
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