I suggest you try using OrcaSlicer, which has an organic tree support style not available in Bambu Studio.
I made a .step file for a 100mm tube in Fusion 360, with a 4mm outside diameter, and 3mm inside diameter. Sliced in BS with a 5mm outside brim, the first 50mm printed very well, then the filament started to pull the top around in circles and it was just a fused mass above 60mm.
I tried painting a manual tree support, painting just a single “dot” on the side of the tube, but neither BS nor OrcaSlicer would generate a support on the vertical sides. But the Organic style in OrcaSlicer produced a very nice support which held the tube in place up to about 80mm, when the tiny support broke loose from the tube. The surface of the tube still maintained a decent finish up to about 95mm, when I tried giving it some more support with my finger and really messed it up. I think with two supports on opposite sides the tube would have printed very nicely.
