How to build a spring like this one? Thank you

springs-image06 - Copy

Any tip is welcome.

use twist:Infinite

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Thank you Gijs. Could you put any more details? I tried but no result.

twist infinite> use lower and upper midpoint of the surface as start and end, then twist a multitude of 360 degrees and offset the resulting surface in both directions

another method, make a helix, pipe it with round caps, intersect with cylinder, trim or split or however you want, then offset.

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That’s a nicer method I think to get a cleaner edge curve.

To get the spring from the picture you’ll need two of those with 180 degree difference in starting point.