Hello all,

I am trying to reacquaint myself with solidworks after a long hiatus and some of the some of the surfacing functionality is more fuzzy than others. I am using Solidworks 2016 and trying to teach myself the loft function by making a tooth (part file attached). Based on some of the tutorials I have found it seems that a lofted surface between the outer and inner geometries is the way to go but I am getting the error: "The feature cannot be created because it would produce self-interfering geometry." What am I doing wrong?

Thank you