Simply Human Shower Caddy Hook

The Simply Human shower caddies come with a couple of movable object holders that can be moved to the end of any of the shelves. Unfortunately, it only comes with one of each, which means that you can't have multiple razor holders if, say, two people share the same shower. This object is roughly the same as the double-hook that comes with the caddy, although (unlike the original hooks) it can be snapped in without the need for a screwdriver. I've included the OpenSCAD source so that you can customize it to be any other kind of thing to insert into your shower caddy.