Not the most cost/time effective use of my life, but I lost the mount to my shiny metal 3M hook, finally got adhesive strips, and I really wanted to mount the hook. Right meow.

This is a replacement part for the plastic piece (shown next to the printed version -- 2nd pic) that connects the adhesive strip to the hook. Would it be cheaper to just buy one? Maybe. Do they sell spare ones of these in the store? Quite possibly. But you have a 3D printer, I've already wasted my time designing this, so why not spawn one in a mere 30 mins with a negligible amount of filament!