It depends on how fussy you are. You can't make a perfect one. You can fake it though. Use tori booleaned in half and lined up, and stacked high. That will look a helix from some angles, but looks bad from others. Of course, if you boolean the tori down to quarters or smaller, you might have something better, but it's a bit more geometry. The Pythagorean theoreum will be helpful if you're gonna try that. Or you can make a path in spiral shape, and multi-replicate metaballs so it appears to be a helix. Here's a quickie I did with half tori. You'll see that at some angles it's really good, some it's really bad. But, if it tracks the camera, that might not be so bad....