Okay, so I guess the reason my vase is not a solid must be due to the curviloft then? If I push/pull the base profile and then run SolidInspector, I have to fix some reversed faces and internal faces (no hole in face like with curviloft below), but then I do get a solid. If I run Curviloft and then Solid Inspector though, I get the following errors. The hole in the face is Solid Inspector thinking the top of the vase should be covered like a jar...:

I attached my sketchup file in case anyone is interested.

sprocketVase_curviloft_new.skp

I am having a very hard time getting a solid out of my curves/vase. I decided to investigate my base profile more....When I pull each of the faces created by my sprocket profile, for some reason the inner circle is just moving...instead of creating a solid cylinder. Does anyone know why this might be?

Yep, I realized I should be using Joint Push/Pull BEFORE twisting and I felt pretty dumb. Whoops.

I agree that I'd rather have the thickness of the vase just be the distance between the inner and outer walls. The reason I was having trouble is Curviloft only lofts curves, not faces, so I moved on to thickening the vase walls instead. Maybe my knowledge gap is with building the stl model. If I have a gap between the inner and outer surfaces, is that okay when I move on to the stl phase? Or I can make a solid using the vase walls in a later step?

It looks like that because I left the face used for Curviloft up there, but Curviloft doesn't loft faces, only curves. So if I delete that top face, you can see that the vase is just extruded curves. I did give the inner surface thickness.

The Fredo box twist is a great tool - thanks for the detailed help! I successfully made a vase, but I'm still curious if anyone has advice on adding thickness to complicated surfaces like the outside of this vase. I get geometry errors when I use Joint or Round Push Pull (works fine on the simpler inner surface of the vase). In order to print this, won't it need to have a thickness instead of being a lofted curve? (I'm not new to CAD, but I'm new to Sketchup and 3D printing. Thanks for the help.)I guess there's probably a way to fill in between the inner and outer lofts - that would maybe be easier, but use more material.

The original profile can be seen below.

I put the same profile a couple inches higher, rotated it 5 degrees, and lofted between the surfaces using Curviloft. I was trying to replicate something like this twisted gear vase. I'm open to any other suggestions for how to approach it. Thanks for the help.

Interesting tool that I will probably use elsewhere, but it seems like even a slight twist in a loft (made with Curviloft) gives joint push pull trouble. I guess that's just from the surfaces Curviloft built. I'm new to Sketchup and thought it would be fun to print vases with Curviloft. Any suggestions for issues like the one in the attached picture?

So I was playing around with Curviloft, and I was wondering: Is it possible to give your loft a thickness? Even if you select a face to follow the path, only the edges are extruded. It would be great if it functioned like "Follow Me," where you get a thickness. Other than that, Curviloft seems incredibly useful.