In Q3 2015 we will introduce a new feature - TreeViewSpreadExport which utilizes our RadSpreadProcessing libraries to export the contents of RadTreeView to xlsx, csv, pdf and txt formats. More information can be found in our documentation.   

The item contained request for two features - exporting and printing, so I have logged a new feature request for printing support. You can track its progress, subscribe for status changes and add your vote/comment to it on the following link: http://feedback.telerik.com/Project/154/Feedback/Details/166975-add-radtreeview-add-printing-support