My wife is a plant nut, and saw something similar to this in a video. I couldn't find a file for it, so I designed this one for her. It's meant to help hold plant stems together to keep the plants growing upward.

The model scales fairly well, so you can make it bigger or smaller depending on your needs. I included a stake as well, but it can be a little too bendy. You might be better off with a wooden stake to depending on what you're trying to do.