MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
It is filled because of slic3r settings. If you set spiral vase in settings Perimeters will be generated on outter area only :)
If you want hollow part I can generate it :) I will have some time on the weekend. So if you want it hollow leave me a comment here, and I will upload another file and send message directly to you.
Thank you for your comment and have a nice day!