I needed a hook to hold my new Dremel 4000 series unit and the flexible shaft that goes with it. I know that it sounds terrible that I only owned a cheap one, but everytime that I needed it, I never got around to purchasing a good one. I wanted to be able to use this on my desk versus having to take it out everytime that I needed it. The hook that I saw on Thingiverse was a good idea, but two skinny and not long enough to support the device or handle the Ikea Bjarnum shelves and brackets.
Here is the Original one from zi3d;
Here is the shelves involved;