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is there any way to tighten the tention in the small belt attached to the y motor

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I believe my belt is slipping on my y motor and it is causing it to shift my print mid print. I've only printed 3 things and they were each fairly small printing in about 2 hours but lately been trying to print something that takes just over 3 hours and it shifts near the end every time I also tried a different model with a long time as well and ran into the same problem. when trying to figure out what was going on I felt the tension in all the belts and that belt was rather lose I loosened the motor and lowered it as much as possible and got the same issue any advice.

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