Actually I didn't check them but I didn't think that it could be the issue because as I said the problem begin in the middle of print. it's perfect just for the first 40% of the model.
Where it happens is irrelevant. What is happening is at that spot in the print there is a slightly higher acceleration or jerk. More important to figure out the cause of the shift.
First make sure to oil the 6 rods - as printers age friction can go up. Feel how much friction it takes to move the head around. Really feel it so that you can remember it. Then add one drop of oil to each of the 6 axes and feel it again.
Most commonly it's one of the 6 set screws on the axis that is slipping (12 in total). You may have gotten a nice hex driver with your printer (or maybe not). If you did you can access all 6 without taking anything apart. If you *do* have to take anything apart it would be to remove that corner cover (only 2 screws) and pull out the stepper to get at that hardest of them.
You can also mark each shaft and each pulley to see if any of them are slipping but it's usually the one on the motor which is also the hardest to get to.
Alternatively you can put this off, lol. Just lower the speed to about 1/4 speed when it's getting close to the bad spot. 1/2 speed is often not enough.
By the way, if you tighten those set screws you want to really tighten them HARD. If you are using an angle allen wrench it should hurt your fingers when using the torque of the short part of the L. The shaft should actually twist a bit.
When you say "all grub screws", does that include the ones on the motor shafts? Those are the most common to cause this issue.
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