Simple Shirts Clip for Etymotic Ears ER4 Series

Different snap-fit models are available.

The loose model will be convenient for frequent detach and attach, such as desk work situations.

If you use this during walking around, I recommend the bit-tight model.

These models were printed by Prusa i3 MK3S with Prusament PLA, 0.15 mm Quality.

You better put a square flat surface of the clip on a heat bed for stable printing.

FYI… 

Yoshida K and Wada H, “Mechanics of Snap Fit”, Physical Review Letters, 125, 194301, 2020. https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.125.194301