Its basically a bunch of modifiers stacked on top of each other. First I build the shape as a line, then I smooth it, duplicate and scale it, and as a last step I connect it all up as a mesh.
The trickiest part was probably getting the rounded edges right without the mesh intersecting with itself.
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I will have to have a look
The trickiest part was probably getting the rounded edges right without the mesh intersecting with itself.