It’s not top thickness, that’s only 3 layers and the bulge is on more layers than that.
Printed with PLA, 4 perimeters, 15% gyroid, but no infill makes difference, i don’t think this is about shell thickness.
Retraction is good, there is no oozing on retract moves and no stringing on the printed parts.
Otherwise the prints come out okay so i’m a bit stuck with this one!
You can see the bulging in all three edges on the picture, about 3-4mm from top to bottom, then a few ok layers, then again a few layers with bulges on corners.
Slicer is Prusa if that’s relevant.
Any ideas are welcome!
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Does it always happen at the same height? Could be Z axis binding. What kind of printer do you have?
It’s a prusa-style printer, no make or model, i put it together from parts laying around! Edit: Z axis is fine, i regulary print tall objects and there’s no wobble, but thanks!