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How do you extrude a circular plane in two dimensions (e.g. z and y)?

I have a wheel with a tire. I have the rough animation of the wheel, but I cannot figure out how to extrude the tire in two dimensions. I've tried with extrude and scale combined but gives me the result seen in the picture.

Quad view

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To scale in one plane, use Shift+ the axis you don't want to scale in.

For example, if you want to extrude and scale in the YZ plane, you would do ESShift+X.

If you use the 3D Manipulator, Shift+clicking the handle of the axis you don't want to scale (e.g. Shift+click the X-axis handle for the YZ plane).

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  • $\begingroup$ Wow that is useful! Learned something new already today :D $\endgroup$ – VRM May 5 '15 at 12:38

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