I've created a case that will keep your ear hooks close to your airpods! I'm sure this will work with other models of earbuds, however I only have airpods pro to give it a test.
Main idea: I wanted a small case that held both earhooks and also attached to my airpods case so that they weren't far whenever I needed them.
I shrank down the original model(credit below), took off some thread, added in a 5mm hole for attaching the cord and pressed print! I've separated the model into three .STL files, both, lid or base.
Thanks to @zippy-boy for the original model.
The author remixed this model.