It's a bookmark with a rock head.
(This is my model, I published it on MakerWorld: https://makerworld.com/en/models/928393#profileId-891939)
Also PRO TIPS:
- Wait a bit after printing is finished before taking your rockmark off the hot bed (this will help prevent bending and warping of the thin bookmark).
- Ensure the rock head has a lot less infill than the actual bookmark so it won't be too heavy on one side. If you're using my print profile on MakerWorld, you don't have to worry about this.
Tags
The author marked this model as their own original creation.