The Spin tool lets you pick a vertex, edge, or face (or a group of these elements) and extrude them around the 3D cursor (see Figure 6.19).
1. Select one or more vertices, edges, or faces.
2. Place the 3D cursor where you want the center of the resulting “circle” to be.
3. Position the point of view to define the orientation of the spin.
4. Press Alt + R to use the Spin tool.
Spin gives you options for defining the angle of the spin and the number of steps (extrusions during the spin), or for adjusting the center and axis from which the spin takes place. Also, you’ll find the Dupli option, which makes duplicates of the resulting geometry instead of extrusions.
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