How to model an irregular object made of tubes? How can I model this irregular curved torus shape that is in the back of this dolly? I know how to cut apart a torus but I think what I need is for a torus to be extruded along a curve line.
Objects that are made out of tubes can be modelled with curve objects.


Shift+A> Curve> Bezier
On the curve properties make the curve fill type 'full' and set the Bevel depth and resolution to increase the diameter of the tube and the smoothness of it:




The curve on the left is what it looks like after adding it and editing it's shape in edit mode. The curve on the right is after the above settings have been applied.



You can extrude this curve and edit it similarly to how you would edit a mesh, using scaling, rotating and moving to manipulate the curve handles.

If at some point you want it to be a mesh you can select the curve and choose Alt+C> Mesh from Curve