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triniellis - the print feature in Sigil prints the current code file, as code - probably only useful if you want to desk check the code
If you want to print the formatted text follow Notjohn's advice, use the calibre ebook-viewer. It can be used independently, so no need to buy into its library system.
But EPUB is not a very good format for printing, it has no concept of page size etc. So I would convert to PDF or a WP format, you can use calibre to do that. either with its GUI library manager or via its command line programs.
BR