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I'm a beginner at autodesk inventor.
For some instances when I click a region to extrude it doesn't come alone.

The screenshot below illustrates something even stranger.

What should I do to make this not to happen?

enter image description here

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In a sketch, you cannot have two lines that intersect themselves. You have to split them with the Split tool.

Your bottom line for example, must be divided into 10 parts.

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  • $\begingroup$ Just to clarify: this is true only when extruding or doing other specific operations, correct? In general a sketch is valid even if it has intersecting lines? $\endgroup$ – Ethan48 Jan 31 '16 at 16:29
  • $\begingroup$ To extrude, revolve, sweep... you need a closed profile if you want to create a solid. To create a surface, all profiles can be used. $\endgroup$ – Maxence Jan 31 '16 at 17:24

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