Rubbermaid/Closetmaid Single Slot Tiedown

This is a single slot hook mounted tiedown point for Closetmaid ShelfTrack and Rubbermaid FastTrack vertical rails. It works by sliding the longer end up into the rail, pushing the part into the rail's outer face, and then pushing down slightly to lock into place. It's been secure enough for my cables for a few years. The first installation might take some extra force to get in, but it will fit and is reusable.

For FDM, I recommend on its side, so that all the layer lines are vertical when installed. This requires support, but has been worth it for me. PLA with 20% infill has worked for me.