Lines on Prints but only in certain areas

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Mr Jason

(@mr-jason)

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Lines on Prints but only in certain areas

Hi all , hope someone can help me solve this issue my hair is being pulled and it hurts lol, i printed 9 x thin parts vertical on my Prusa Mini, but the one rear print near the back of the printbed has awful layer shift ridges and lines , the rest were fine but then as it went higher these lines disappeared and the print was smooth again, see pictures, any ideas why this would happen ?? the worst was at the rear of the print bed the best at the front.