I got tired of my bluetooth headphones sliding to one side. Designed this to tightly hold them still. It fits a 4.1 x 1.3 mm cord very tightly (it was the point). The clip is an old one I broke just glued to the back.

This was printed with a .2mm nozzle at 100% infill. I have not tried printing with a .4mm and am unsure if it will work.

This was Designed for my needs, not to be universal. I make no guarantees till work for you, so be careful you don't damage your headphones.

The damage you see to the cord In the picture is from an earlier prototype where I forgot to mirror the connectors.