@Osfald's connector is cool but not strong enough for my use so I have connected two of them together. Let's see how long it will last :)
Also because my chain balls are smaller (2.8mm), I have scale the connector down a little
Printed with PETG and layer height 0.1mm
OpenScad source file:
scale([0.92, 0.92, 1]) {
import("connector.orig.stl");
translate([5,0,0])
import("connector.orig.stl");
translate([10,0,0])
import("connector.orig.stl");
}
The author remixed this model.