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Bizarre loft - what am I doing wrong?
I am no expert, I only use Onshape as a hobbyist to knock up designs to 3D print or laser cut. I would like to use lofting as I think it would highlight errors in my designs. However I am having a problem getting it to do what I am expecting it to do.
I have had some success with lofting in some of my other drawings, but in my test drawing, in which I am trying to get a handle on what it does and how it works, I have had the least success.
The drawing is here https://cad.onshape.com/documents/cbd7d887ae48f2be4db0ff54/w/eac3cb3d5ff0241bcc47c72e/e/0528c2ea3445c4b043ad4564
In the top loft, even if I just loft between Former 1 and Former 2, one side works as expected, but the other side has a strange crease down it. I really want to loft from the first point (vertex) to the last point. When I do this one side works, the other side looks like the Elephant Man. The lower loft works slightly better, but I cannot get it to loft from the first point to the last point at all, instead red lines are drawn, and I cannot understand what they mean or how to correct the problem.
I have made sure all the faces in the loft are identical in every way except size. They are very simple shapes consisting of two mirrored splines.
There are no error messages displayed or any indication other than the red lines of what the problem is, and I don't understand what the red lines mean.
I've tried adding guides and paths and matching connections, but none of those efforts have rectified the problem.
Is there something basic I am missing, or have misunderstood?
All advice gratefully received,