I made this for a design competition on My Mini Factory, and thought I would upload it here! The handle is one print, no support needed, and fits on the bottom of a cardboard tube. The cardboard tube I used was from a large roll of tinfoil that was gone. This one is designed for tubes with a 30 mm diameter hole. It should fit fine, but you could hot glue it to keep it in place. If we get enough likes and downloads, I'll design another one for larger tubes, like paper towel rolls!