Horns of Kanna Kamui from "Kobayashi-san chi no Maid Dragon" anime series.
Modeled using Fusion360. The holes on the bottom are supposed to be slots for the band that I have not finished yet.
Scale to the size you need them to be. By default they are huge, that is 28cm long. The "Big_Indent" and "Small" models are parts of the same horn, small being cut from the big one to allow printing on small printers.
Supports are definitely needed but it prints nicely without any infill. The right one was printed with 0.4mm layer width, 0.2mm layer height, 3 perimeters and no infill. The left one: 1mm nozzle, 1mm layer width and 2 perimeters without any infill.