Hi all,
Last print failed, it started to wobble:
how can I add (tree) support to prevent wobbling ?
Or you could just slow it down.
Is this intentional?

It looks like the model is moving over to small an area, keeping the thinning model hot enough to stick to the nozzle. That’d cause wobbling. Printing two of these simultaneously may help (if that is indeed the problem).
But in that case you may want to slow down, reduce jerk higher up.
I have had very limited success adding tree/organic supports to stabilize a vertical surface with OrcaSlicer, and no success at all using Studio.
Model was a tall tube 100 mm high, 4 mm OD, 3 mm ID. Shown here with support on one side, but it worked better with two small “spots” manually painted on opposite sides.

Support x/y distance was reduced to 0.01mm, so the supports did not actually touch the model, but did restrict the wobbling.
I have tried painting other vertical surfaces, but usually no supports are generated.
Same here. I can’t manual add support to a tall object. In my case its a RC Wing.
Welcome to the forum.
There are a couple suggestions of how to add support to vertical models in the thread about. Have you tried them?
Beta 1.10.0
Bad joke incoming…
Beta, I barely touched her!