My rubber tree got top heavy and bent. I decided to use plastic to solve this problem and have included a parametric fusion 3d file so you can fit the print to any of your use cases.

Essentially, this file is broken out into a top and bottom cylinder. I added a lip to help the pieced fit together. If you open fusion 3d, you should be able to set the branch width (the width of the stem you are trying to fix), the branch length – ideally 60-120ML+ to give proper support, and the width of the support (recommend keeping it to 4+ mm)

I didnt want to overengineer this part – so I used duct tape to secure it.