Updated chain link for things like necklaces and bracelets. to print multiple links in Cura, just right click on the single link 3d model and select "Multiply selected model". I found you'll probably need to print out around 85 links to get a minimum decent sized necklace, but all those should easily fit on an average print bed with room to spare. this should be printed at 100% infill
Also, if printed in PLA, the links will warp open if they are left hanging in a car on a hot day.