It's the Wedge! An unusual bookend to keep your books in order while encouraging you to engage with them instead of letting them collect dust on your shelf!
It's originally designed to be made in marble but printing them will also be just fine!
Sharing the hollowed out version of models for you to fill them with some sort of weight (sand- lead etc.) mid print.
You can also use them with some grip tape on the bottom of left and right pieces I guess.
It also has a cool display case. Enjoy using it!
The author marked this model as their own original creation.