1.42.0 b1 win64
Concentric patter is great for rectangular shapes like a Archimedean chord for circular ones. But it is a set of independent rectangles while it is easy to make them continuous. That would bring better bed adhesion and faster print because of less retractions and turns.

Same approach can be used for non-solid Archimedean chord, Octagram spiral, and others.
could you draw an example of the path to create? I can't visualize a better pattern than the current one.

Finding such a curve for a general polygon is non-trivial. I have seen a paper I believe in Siggraph, that described such approach. Their results were not convincing to me, as they were leaving a lot of gaps, and it was very computationally intensive.
Concentric already leaves lots of gaps. The connection points are at the extreme angles. Computational intensity like aligned seams.
The connection points are at the extreme angles. Computational intensity like aligned seams.
Please provide a pull request then.
Sorry, I don't have spare time to code.
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