Hello, looks like we loose some step or belt toth jumped in Y direction (it can hapends) please ensure you have the belt well tightened, for noe I have no another Idea, maybe somebody next will know, next way is use Z jump in Simplify3D (it helps foe non printing movement, but add some time)
I agree with Stepan. This looks like either A) Belt jump on the Y axis – In which case you’re either moving way too fast or your belt is loose – or B) the print head crashed into the part knocking a layer loose – I think that’s a bit of a long shot, but adding a z hop during retraction will ensure the print head is clear of any parts – it will probably increase light stringing though.
Edit: Looking at this again I would say its gotta be a defect in the slice (check your gcode before printing) – or belt hop. I don’t think it could be print head collision because there’s really no evidence of failure above the layer shift.