Bead chain connector

This part is also called bead cord clasp and ball chain link. Used in roller blinds. Connects the two ends of a bead chain (small plastic balls on a rope).

Designed for beads that are exactly 3mm in diameter.
The inner size of the connector is 3.1mm, so it makes a perfect fit. (Technically tight fit :) )

I recommend to print it in the highest achievable quality setting.
Set infill to 100% Print vertically, or print multiple instances at same time with different orientations.
Supports would be impractical, hard to remove and could also ruin clearance.
Use whatewer filament you like or have, I choosed PLA and worked out well.

The thing is tiny! Only 11mm long and 5mm wide.