Making Profiles From CAD DWG/DXF Files

Step 12 Analyze it.

Now Analyze the Sketch with Sketch > Analyze, to heal any open loops because of lack of endpoint constraints due to the sketch originating from 2D CAD. Heal any other problems that are possible. Sometimes the Heal button will not be active for a specific problem listed. First deal with any problems where the Heal button is active, and then return to these other problematic conditions afterward. Often the Heal button will activate for those problems after the others have been dealt with. Fix any other problems that the Analyze tool can not automatically resolve, and then any drafting errors encountered in the source file. Often curves are not tangent, or lines are overlapping from not using object snaps.

NOTE: I Analyzed the profile before Constraining and Dimensioning so that you could see how the object snaps do not guarantee endpoint position as discussed in Step 9.