I was inspired by a reddit thread in which someone made a charging station for their headphones with a magnetic charging cable you can find off of Amazon. The original user didn't share their model, so I've made one myself. It's adjustable through the parameters in this OnShape project, so you can tweak this to fit most wireless headphones with a charging port on the bottom of one of the cups. You'll want to adjust it for whatever cable you use. Mine was 8mm diameter with a 10mm diameter lip, but you may want to adjust it to have less tolerance. If you find it to be too loose, you can wrap the end in a rubber band or tape to keep it from falling out. I printed my with a .6 nozzle in PETG and got a bit of warping, so maybe consider a brim or mouse ears.

OnShape project:
https://cad.onshape.com/documents/07f1a328756430a587799622/w/af3ba4e24265f90acefab3e2/e/725641f1ab4be14f41560a09?renderMode=0&rightPanel=variableTablePanel&uiState=65c2e8457fc967692a3f2a9e

Magnetic cable I used:
https://www.amazon.com/gp/product/B0BPR6FL7M/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1