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It's almost always the pulley on one of the motors - I can't see it very well in the photo but I think it moved in the Y direction, correct? Towards the front of the machine? So it's the motor on the back left corner. Remove the metal cover that hides the Y motor (only one screw holding it on) and push the head around until you can access that set screw. Then tighten the screw on the other end of that belt while you have the tool in hand.
The pulleys on the long belts rarely are the problem but occasionally are the problem.
Reloading the firmware should not fix this problem. It could be that you simply don't see the problem anymore. Its far more likely that the problem is caused by a pulley as gr5 mentioned.
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gr5 1,873
It's almost always the pulley on one of the motors - I can't see it very well in the photo but I think it moved in the Y direction, correct? Towards the front of the machine? So it's the motor on the back left corner. Remove the metal cover that hides the Y motor (only one screw holding it on) and push the head around until you can access that set screw. Then tighten the screw on the other end of that belt while you have the tool in hand.
The pulleys on the long belts rarely are the problem but occasionally are the problem.
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