I can't seem to figure out how to combine the two sketches below into a single 3d solid. How do I do that?
You can do that using Loft with close profile option. See attached example that I create several years ago. The keyis that in your two sketches, you need to split your splines into two segments or sketch them separately.
I should add that I also needed another sketch for the guide similar as in your sldprt.
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