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It should be printed like this. Standing upp just like in use. is there anyway you can post a picture. I don't really get what you mean by "the two horns". Try printing it with a different layer-height if its possible. (0.15mm or 0.25 mm) I tried it on both of my printers. (wanhao i3 and my hypercube i had zero problems with 0.2 mm layerhight.