Stretchy flower-like links make this a fun variation on chain mail.

I was inspired by this page on Circle Knots, https://www.cs.duke.edu/~edels/Tubes/knots/circ/, and decided that if I flattened the bottoms out I could make them printable and interlocking.

The different versions have different sets of parameters that are included as comments in the .scad file. There are two basic symmetries, four-fold and six-fold (controlled by the tiling angle), and you can theoretically use any number of loops that is a multiple of the symmetry. So the four-fold symmetry model could have 4,8,12,16 etc loops. Practically the number of loops is limited by how narrow a cylinder your printer is capable of combined with the size of the link. I'm not sure I can go past 8 without modifying the knot function.

magic.scad contains my function for sort of smoothly sweeping a sphere through space, which is used by knot_chain.scad.

Printed in PLA 0.2mm layer height, 10% infill, 0 shells, 80/100 mm/s, 215deg, on a Replicator 1 with a glass build platform and active cooling fan.