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I think what Makers Muse said is vise versa. If you get a lot stringing (with a specific printer, a specific model and a specific material) turning off z-hop helps to get rid of the stringing.

And I say if I don't have stringing in my specific situation turning on z-hop helps to get rid of the scars. There is no right or wrong.

But I would like to know if the z screw really isn't precise enough and can cause other problems with z-hop. I'm not sure about that.