Print problems caused by seam?

[dtmr]

I have trouble printing a bellows from TPU 95A. It prints great at first but at some point, it begins to lay every second loop wrong. Filament loops fall down:

The problem begins/end in the seam area, were the loops around the perimeter begin/end. However, while I see a one seam in Bambu Studio, in reality the problem begins a bit before and a bit after the seam. Also, the seam in the software is a straight line, but the problem areas in the print are arranged in a “V” (seam right in the middle)?!

Strength 0.2mm. Angle of the folds 45°. Wall thickness 0.82mm in straight parts, 0.7mm in chamfered parts (F in picture; to make the bellows less stiff).

I use the classic wall generator. It leads to 3 wall loops in straight parts, 2 in chamfered parts.

I print Elegoo TPU95A at 55mm/s, 225°C, 0,4mm nozzle. I use the Bambu TPU 95 preset with small changes (lowered cooling from 100% to 75%).

[Bullocks]

Use the preview tools slider on the bottom to inspect the order the walls get printed. That line type preview makes it look like you have outer walls and gap infill, not outer walls and enough space for a full inner wall. It might be trying to print the overhung outer wall first and you may have more success if you can convince it that you have an inner wall and the strategy of inner-outer can be applied. Cad to thicken the part slightly or xy contour or thinning the line width or Arachne are all options