My son wanted a celtic knot bracelet. This library was used to create my first attempt. The knots look like:

The library provides two interfaces. The first API uses large knot parts (called pieces in the code) and looks like:

knot([ "<~>",
       "!&;",
       "[-]" ], tile_width = 5);

where the first parameter is an kind of ASCII art for the desired pattern and tile_width is the knot tile size. The "alphabet" for pieces is generated by knot-piece-alphabet.scad and looks like:

Each pieces is a 2x2 square of smaller knot parts (called tiles in the code). However, edge and corner pieces have some empty tiles.

The second API uses knot tiles and looks like:

fine_knot([ "<rq>",
            "AtYF",
            "EGhW",
            "[sd]" ], tile_width = 5);

where the first parameter is an ASCII art for the desired pattern and tile_width is the knot tile size.

The "alphabet" for tiles is generated by knot-tile-alphabet.scad and looks like:

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