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Trouble combing two thickened lofts
This is for an extension to a cycle mudguard at https://cad.onshape.com/documents/655fb46210eab35462ca6602/w/dd720d6171433626b1d8aa2a/e/00661d304889002974745606.
I have lofted two surfaces and thickened them to create two parts but however I choose to combine the two they will not join and I get red warning lines crossing both parts. The first image below shows the two parts seperate, the second shows what comes up during a boolean union.
One of the parts is generated from sketches 1-3, the other from sketches 3a-4. Sketch 3a Uses parts of sketch3 but is formed on it's own plane that is on the face of plane 3. In fact I have tried various combination of using faces or planes on which to base sketch3a but always with the same result. Since the problem is on only one side the cause should be obvious, but I just cannot see it
Help in pointing out what is probably blindingly obvious would be appreciated.