I had bought a toilet paper holder with an integrated shelf and put it in one of our bathrooms. My wife didn't like it because I didn't sand down the drywall and re-paint after I took the old one off and before I put the new one on.

So... I decided I would try to design a shelf which attached to our existing toilet paper holders. This has gone through a couple iterations with tweaks to the design and dimensions. But now I can declare success!

You will need to print two of the legs. For one of the legs, you will need to "mirror" the leg for the opposite side. I would rotate the legs so that they are flat to the surface of the bed with the open clip facing up.

There are 2 tops. One with square corners (v1) and one with rounded corners (v2). Print whichever one you prefer. Rotate the top so that the cutouts are facing up and the flat is facing down.

Be careful putting the legs on the TP holder. The front/thin clip might be a little fragile. With care, they can be mounted without breaking anything.

There are holes on the bottom of the shelf which lines up with the tops of the legs. Press fit them together.

I've uploaded an installation video in case you're having some trouble - https://www.youtube.com/watch?v=W8IlGfLjcss