I didn't see this mentioned earlier but each link is about 19.5mm from the center of the connection points. I printed out 39 "chain link" pieces, 2 "cable_chain_extrusion_mount" and 1 "extruder_mount". The settings I used were .25mm layer height on a .4mm nozzle, 4 top & bottom layers as well as 4 perimeters with 25% infill. They were printed on a PEI surface at 75mm/sec with the hot end set to 230C and the print bed set at 60C. The entire print job took around 12 hours.