Quickly designed for an event to manage some cables, these hangers are specifically designed to match the girder sizes of my patio, which is some former owner's home improvement nightmare. But I've provided the loose parts as well, so you can adjust the specific size to your own needs. Definitely print this in PETG for the flexibility.

Good for hanging fairy lights or suspending heavy-duty cables, but nothing overly load-bearing; I tested with a hanging plant pot and it immediately popped off the girder. UV damage will also likely compromise the integrity over time as well, these were designed for a single event.