two different makes, the one thats Not around my neck was made on a .25 nozzle, which was able to eliminate the tiny gaps in the surface. Another make that was a gift and i forgot to get a picture of had the Triforce portion top infil as Concentric, which makes it look VERY nice. Concentric doesnt work on the large crescent part though, too curved, so i just did it on part of the model. Try that, in slic3r use a "modifier" by opening the object settings. google around for good instructions and play with it, its really cool.