I have this basic shape, made from two cylinders, and I want to know how I can twist the curved path, highlighted here:
Rather than curving the whole path, I only want one small 180° twist on the highlighted portion, similar to this Möbius strip:
Is there an add-on that I could use for this, or, if not, how would you go about it? Right now, I'm pretty stumped, I tried splitting it into two parts and using proportional editing, but it ended up being very messy, though I could have been doing something wrong.
Also, I should mention that, after this, I want to add a "Subdivision Surface" modifier, and maybe 3D print it, so it's important to have clean, efficient topology.