Tubular Rings Puzzle
Generate tubular structures of as many rings of the kind displayed below.
First, note that the ring contains 10 triangles. We can get that from an Icosahedron, by deleting two vertices that are opposite (like North and South poles).
Secondly, we have to find a way to chain these rings. We can construct the convex hull (and compact the result), select the binding face (in Building mode, right-clik on one of the two pentagons), promote the object to default Build module (double-click on the object entry in the list) and then use build addition (click on the binding face).
Finally, delete the interior walls (Delete/Faces mode).