Only found in Twilight Princess, this key appears multiple times in each dungeon. After finding one of these keys, you can advance into the next room.
The model isn't full scale. Scale it up around 200~300% for the real thing. Print with a raft or brim for better adhesion (especially the two teeth at the tip). Support material is not required but it will improve the print. I tried to design this model to be as support free as possible, but unfortunately you might have to use a very small amount at the top.