This "shift" is very common. One of your pulley's slipped. Either X or Y. I can't tell if your shift was in X or Y but you should be able to tell.
Tighten the hell out of all 6 setscrews on the 6 pulleys for the axis that slipped. Not just the 4 pulleys on the long belts but also the 2 pulleys on the short belt (the belt to the stepper motor).
Also consider marking the pulleys and rods with a marker to see if it shifts again you can tell which one shifted.
Also your UM should have come with 12 extra set screws that are silver colored. These screws are better than the black ones that came with the pulleys.
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taavet 0
oh, sorry - this thread should be under "art of printing"!
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