This is my take on the Dungeon Key which shows up in chapter 12 of the manhwa. It was a pretty nice little project. My only issue was that I accidently broke it while gluing the pieces together.
I go into depth about it in my video: https://youtu.be/Oh9vxVFo62I
I used the two partial_key.stl pieces. I haven't tried the full_key.stl but I included it in case someone wanted to try it.