We wanted something to hold up lights and maybe hang plants up high around our deck. The inexpensive metal plant hangers, normally designed to be pushed down into the ground, turned out to be the perfect solution. I had to cut the horizontal part short, and didn't want them to be a cutting hazard, so designed these caps/covers for them. Also, one of them broke completely off, so I decided to put caps on the vertical parts as well, to prevent them from slipping down.

ASA might be best, but I printed these in ABS and they have been holding up just fine so far. There are four different sizes, depending on the diameter of the rod being capped.

8mm, 9mm, 9.5mm, and 12.5mm