Earbuds, eartips, spugnette, gommine, auricolari o come KZ li chiamate.

How many times you loose or broke some earbud and cannot use some audio device?
Here is the answer: make your earbuds.
I've made it in two size, tested without postprocessing and they work fine but some sensible ears can appreciate some smoothing on the surface.
Smooth it with a dremel and go.

Do you like it ?
Ask you only a like, nothing more :-)

Suggest this print setup:

TPU, 220°/60°
layer thickness 0.12
speed 30mm/sec
infill 20%
wall 1
base layer 1
top layer 3.