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I've extruded a set of points based on a z variable but I want to increase their width so they're easier to see.

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Assuming 3D Analyst also extrudes polygons, buffer the points before extruding them. –  whuber Mar 16 '11 at 18:38
    
As Bill recommends, you will have to buffer them. If the points were not based on an variable attribute you could have used the 3D Simple marker symbol (Cylinder) and set the cylinder Z size to a desired value. –  Jakub Mar 16 '11 at 20:02

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