Hi,
In addition to the suggestions above, you can use Blender 3D, which is a very powerful general-purpose 3D modeling software that is also free to use. Blender has the so-called mesh modifiers which you can stack to produce very complex periodic shapes like that of a screw:
The example above took me a few minutes to make by stacking a screw and a scaler mesh modifiers to achieve a shape similiar to your example. Once you’re happy, just export it to, say, OBJ format which is readable by VTK.
regards,
PC