You can Print and email lists from the Web, Mac, iOS and Android Wunderlist apps.
On Mac & Web
Select the list you wish to print or email and then select "More" from the Action Bar (located either at the bottom of the screen in Mac, or in the top right for Web). Then just select Email List or Print List.
On iPhone & iPad
To print or email from your iOS device, first open the list then tap "More" from the Action Bar at the bottom of the screen. Here you will find options to print or email your list.