I printed this at .2mm with PET-G. The design is quite sturdy so it should withstand all forces with PLA as well.
After printing the first step is to put two pieces of rubber inside the clamp, where it makes contact with the chair tube. After the support is mounted on the chair I used two leftover screws from my playseat challenge and mounted the gear shifter.
If anyone needs the source files I can share those too.