Trefoil Knot (Square Cross Section)
grabcad
A square version of the Trefoil Knot (Circular). A trefoil knot is this simplest non-trivial topological knot. See the <a href="https://en.wikipedia.org/wiki/Trefoil_knot">Wikipedia page for trefoil knot</a>. This particulare shap is very interesting because it has only <strong>one surface</strong> and only <strong>one edge</strong> but yet it still has volume. This shape is fully 3d printable. Just download the STL and go! To see the one that I 3D printed, see the renders.
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