ok so i printed the quadcopter arm to test the strength of pla parts, after breaking it, this is what the cross section looks like. Its like this extremely consistently, all the way through the part, the black arrow shows where the wall is so distorted it doesnt even meet up with infill, and the blue shape exaggerates the distortion of the inside wall of the tube, while the red shape exaggerates the distortion of the outside wall of the tube.
Ive double checked the belt tensions, and there all fine, I find it extremely weird that the inside and outside walls are not distorted in the same direction, and that its distorted in exactly the same way on every layer