This ornament has a printed plastic chain which passes through the center of the ornament and comes out through the bottom, where it projects downwards as a finial or icicle decoration. It looks weird as positioned in the 3D printer but that is done to reduce the cost. When you hang the ornament simply drop the chain through the bottom 1/2 inch diameter hole.
The large loop attached to the top hanging chain can be converted into a hook by snipping off the thinner portion of the loop with a pair of wire cutters or fingernail clippers. The body of the ornament rotates relative to the hanging chain if you wish to reorient the ornament facing direction.