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The lace fasteners/connectors on my son’s shoes eventually came off, and although I found some online, none of them worked with laces that had been sewn together at the ends. So I made my own.

They work by having two clamps that press the laces together, with the casing holding these two clamps in place.

If they feel a bit loose, I’ve included the STP file so you can make the jaws wider, and you can also use 2K glue to help. In the f3d file, you can use the "tighten" parameter to adjust the fit and the "scale" parameter to adapt the model for different sizes.

For reference: my son’s laces have a diameter of 3mm and they get squeezed to 2,5mm.