KALLAX Book Ends

These are a first go at some basic book-ends for our KALLAX. We have a number of books for our daughter, and the were starting to easily fall off or tip over. This was a quick project to help prevent any potential falling-book accidents. The main goal was simplicity, so you just use the existing screws/hardware to put the bookend in place and it's reasonably sturdy.
I would like to point out that **there are some issues**; specifically to prevent the rotation of the bookends you need to have the screws fairly snug against the bookends mounting point. **this does cause some warping of the material (due the pressure from the screw), and it's very easy to create cracks between the screw hold and the supports**. That said it prints pretty quickly and I hope people can improve on the design.