SO MANY BRIDGES. 
You'll need a good amount of part-cooling to make this one work as you're going to have to do some pretty long bridges. So many bridges. 

I haven't tried it without supports for the middle link that stands up on the build-plate, though I've had success using a modifier to have the rest of the links unsupported. 

This was intended for use with door-signs that I also print for work, and using one pair of the Short chainlink file is generally good enough for holding a sign across a door with a fair amount of slack.

(That is print two (2) short chain links to hold a sign across a door, plus two (2) terminating links )

I also included my original long-chainlink file, seen in the pictures.

Also included and likely necessary for most applications are Terminating Links. The v1 version has both pieces printing together. A well calibrated printer with good tolerances can have them press-fit together snuggly and firmly without glue.

I included my original one with the loose tolerances, with a 0.2mm gap between the dovetail sides in case some folks have printers that are not as well calibrated.