I got this helicoid structure in STL file, but I want to build it in 3D modeling software (SolidWorks or Rhino), who knows how to build it? Any ideas or suggestions will be highly appreciated!
I would draw a straight line, the required length. Then at one end draw another line, on a plane perpendicular. Surface sweep the 2nd line up the first one, and set sweep option to twist along the path. Then thicken the create surface.