Three years ago, I designed this Balloon Cart in Tinkercad. I thought I would feature it in this blog because I been finishing up another similar project. This design has been downloaded numerous times from Tinkercad. I think they are just after my balloons.
Here is the link to view it in Tinkercad: Balloon Cart
This link will let you view it in MakerBot Thinkverse: Balloon Cart
I do not believe that it can be 3D printed without some tinkering.