Celtic Knot Shapes

The shape is whatever the SVG draws: filled areas and lines alike. If it's a line drawing of an outline, tick Fill inside closed lines.

One strand adds breaks until the whole knot is a single strand, then sprinkles in more where they keep it that way. Random just sprinkles. Mirrors and turns shape both; with them on, a few strands may remain.

Mirrors copy each break you click across the middle of the shape. Shift-click changes one dot at any time.

Carved: flat-topped strands with the background cut away in sloping facets, like the carved ring. Width sets the flat tops; about 0.3 mm suits it.

For Blender: install make_knot_shape.py as an add-on, then Copy for Blender and choose Add > Mesh > Celtic Knot Shape. It builds the same design at full detail, with a fused print solid and the exact weight.

The STL is in millimetres. Strands overlap where they cross; slicers and casting services merge them, and Blender can join them with a Union.