Made this model to replace a broken bead chain connector for my Hunter Douglas roller shades chain. The beads on my chain are about 4.4 mm in diameter. Took several iterations to get a good fit; this one has been working pretty well even on some heavy shades.

This requires a bit of force to push the bead into the slot. I used a hand plier to press the beads into into. Real picture shows my print which used Bambu PLA Matte filament and my A1 mini on the 0.08 HQ preset.