Pipe / Tube along a Path
This command creates 3D mesh(es) corresponding to a circle extrusion along path(s).
Requirements
Select one or more paths (polyline, set of polylines, trajectory, linear geometry, CAD wire, CAD curve, or CAD compound with wires and curves only) to extrude along.
Define the Radius of the circle used for the extrusion computation.
Check Close extremities if you want a closed mesh as output.
Notes
If the selected path is closed, the resulted mesh will be necessarily closed. So, the option is greyed out if all selected paths are closed.