How to cut out a series of Helix to form channels?

I drew a couple of helix (I need 6 of them actually) that spans from the bottom of the plate to the top. I need to sweep those helixes such that they form channels that allow a fluid to flow through them. However, I tried sweeping, the preview shows me a complete sweep, but what comes out is a partial sweep. Can someone help me out on this?

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2 Answers

You can use Helix with the taper option to get the same effect.

Answered with a tutorial:

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