Jim, yes I printed them and the way I avoided any support was printing them at a 45 degree angle, and a fine resolution. They came out great. I think I may have a pic showing the part orientation. If I'm going to make more in the future, I would like to try printing out of nylon, not that mine are worn but I really avoid driving it on anything but dirt if you know what I mean.
Heres how they printed... And a little trick i use when the part doesnt have alot of area to stick to the build plate in the printer like the chain here, is to design a small pad onto the part that gets printed like a foot, and later is easily broken off after the part is done. I loaded the build area up with as many tracks as i could fit. Hope this helps.