A case made specifically for the KZ ZEX to help against any kind of tangling issues or wire damage .  It can also possibly be used with other IEM with similar design like the KZ ZST x or the KZ ZSN ( not tested). The case is made so it can fit in most pockets Without any problem although a little big fits well and doesn't cause any comfort issues .

The Model dose require some supports most parts have been designed to be under or equal to 45° so its easy to print and some parts require less than 4mm of bridging. 

References and Idea taken from :https://www.thingiverse.com/thing:5323553 ,https://www.thingiverse.com/thing:5323553 and https://www.printables.com/model/64469-kz-zsn-pro-and-zsn-pro-x-faceplate