These little horns print wonderfully without any supports on FDM printers like Makerbots, designed with loops to be stitched in to a wig. You can find the wonderful Charlie on tumblr at http://alfonzo-the-cat.tumblr.com/ <3
For best results, use no infill, no supports, and no raft. The horns include two plastic loops, so they can be stitched in to the base of a wig. They look awesome in translucent PLA!
For ideal results with MakerWare, select the horn, click the rotate tool, click it again to open it's popup, then enter -225 in to the Z rotation input and press enter. This will rotate the horn so each step up (the zipper) is happening along the inward curve, making it less visible.