update: after using it on many plants, PLA seems to be too weak; it bends over some time.
I suggest using harder filaments, like PETG, maybe?

I was in need for a plant stake for a lot of my plants. I designed the plant stake to be strong, easy and fast to print. designed to be support less.
You can print these and stick them together with glue afterwards to achieve your designed height.

layer height: 0.3
infill: 10%
2 walls
2 bottom/top layers