Uneven prints "higher up"

I’ve printed this model on my H2S: Art Deco Table Lamp - LED Lamp Kit 001 - Free 3D Print Model - MakerWorld and there are some uneven parts towards the top of the print - see pictures below. Any suggestions what may cause this and how I can avoid it? (I have recently re-run full calibration.)

Was the chamber heater running?

It’s printed with PLA - no chamber heating. I’m not entirely sure whether the door was open, though. I sometimes leave it open with PLA because in my experience, this has in the past reduced stringing.

Offhand it looks to me like the tall skinny verticals started wobbling as they got taller. The photos are a bit small so not entirely clear. But could be because the nozzle started hitting it a little, or just from the printer movements. Perhaps the whole piece warped a bit (raising it up off the plate in the corners) which could easily cause that. In the latter case slowing down speeds/accelerations as the print gets taller could help (for speed there’s the automated “reduce by height” settings but accel. is trickier).

Are those tall vertical corners supported at all? If not, I’d say they probably need some (I didn’t open the MW file to see how it’s set up by default). But if it’s a warping issue then that should be addressed first, IMHO.

Not entirely related, but looking at the top left corner of the 2nd photo, with that ridge after the corner, makes me think the transition speeds could be smoothed out and (as usual for nicer prints) the wall speeds/acceleration could be lowered.

-Max

Thanks @MaxThreeD! It definitely didn’t warp/wobble - there was plenty of support at the bottom (but not at the top) to keep it fixed. I’ll look into the speed/acceletation settings - many thanks for pointing this out!