This is a 3D Printed Hanging Book Shelf inspired from AGUSTAV Book Rack: https://agustav.com/products/bokasnagi?variant=31972303863898
You can display up to 9 books.
Shelf dimensions 305 x 30 x 15 mm. You can easily print it in one go on a Prusa MK3S.
The G-code includes shelf and 6 hooks with base.
Use 60 cm piece of string for one hook.
The author hasn't provided the model origin yet.