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What would be the most efficient way to make a spiral curve for objects shaped as in the photo?

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2 Answers2

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You may do it using Spirals of the Curve Extra Objects add on. enter image description here

Activate the add on in User Preferences-->Add-ons (Ctrl+Alt+U). enter image description here

Add a spiral and play with its settings (Spirals panel in a Tool Shelf). enter image description here enter image description here

Extend the spiral's lenght extruding the curve's points. Add a Bezier Circle in the same position as the spiral is. Scale it to give a curve a desired thickness. Apply its transformations (Ctrl+A-->Rot&Scale).
enter image description here

Select the spiral in Object Mode, go to the Curve Data header and set the Bezier Circle as a target of the beveled object. enter image description here

Select the very top point of the curve, enable proportional editing and translate it along Z axis a bit to hide the ugly end of a curve. enter image description here

You should get something like this: enter image description here

To make make it gradually thinner in the inside select the very top point of the curve and scale it a bit with Alt+S using the proportional editing. Then scale it with S with a big proportional size falloff. enter image description here

You may also use the proportional editing to easy change the curve's height. enter image description here

Paul Gonet
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I'd believe using a curve and a bevel object would yield the expected result.

You may change the radius to make it thinner or thicker

J. Brosch
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    Could you expand your answer? Maybe add some screenshots? How make it thinner in the inside? – cgslav May 17 '17 at 12:48