Slides over the edge of a shelf. Great for headphones, cable management, decorations, etc!

I adapted LerouxB's cube wall hook to slide horizontally onto a shelf edge. I had made a few before in sketchup, but these are customizable!

v1.1 updated to fix a long-lived bug! Thanks @Arcturuss

Pretty resilient to changes to any of the variables, with a couple exceptions. Thickness greater than about 6 starts to make parts miss due to curve/rectangle intersections. Amount of hang-down also has to be more than the thickness.