Over the weekend I did some experiments with creating 3D printed ABS parts that linked and rotated. First I tried some clips, little mushroom shaped items with a slit through them. These did not print well being a bit blobish due to their small size, and the clips were very fragile.
So I made my pin and hole bigger 4mm and 4.6mm respectively and added a self tapping screw and washer. I did leave a hole in the middle of the pin but ran through with a 2mm drill.
After a little sanding, this worked quite well