Make all the parts in all three plates: black.stl, white1.stl and white2.stl. They assemble from smallest to largest and are put on the plate in order. Thread a cord through the knot piece, down through all the keys on one side, and then back up through the holes in the keys on the other side, and back through the knot. They tie the cord around through your collar on your shirt and you're good to go. When in doubt, reference the allparts.stl file, though that one wont fit on the build platform. This tie would work if you scaled everything down 80% or just leave it as is.

-Todd