Although this only contains one little link as the model, it can be cloned and snapped together to make a chain (as seen on my kitten Priscilla).

Clone as many links as you want, then snap them onto eachother to make a chain or necklace string. 

You can also clip one onto a pendant and make a fully 3d printed necklace.

It's quite weightless for one link (.15 gram), and still weighs very little for a whole bunch. It can be infinitely long if you wish, but i suggest 25-75 links to make a small choker or long necklace.