I invested in some mini handles and wanted to store them with my paints on my paint rack. These are designed to very snugly fit the Citadel Colour Painting Handle (Mk2). The handle can be inserted from the top, and will not slide out once it is dropped in. The hooks can be mounted adjacent to each other without the handles interfering.
Based on the universal hook base design from https://www.printables.com/model/183085-skadis-universal-hook-base-and-modified-hooks and https://www.thingiverse.com/thing:2853257/files but the hook file attached has been modified so that the bottom of the hook does not penetrate the back of the board (for my double sided paint rack).
Materials and print settings do not matter much, no supports needed. I do recommend printing the hook with the top down so that you get a nice top surface.
The author marked this model as their own original creation.