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Ultimaker shifts after a couple of layers during printing

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It's rare to shift in X *and* Y at the same time but possible. I would first tighten the tiny set screws on all the pulleys. I believe there are 6 for each axis. The most likely are the 2 pulleys for each axis on the short belts (motors).

However is it possible that your part came loose during printing? Was it still stuck to the bed when the print was finished? If not then you can improve the stickiness of the blue painters tape by rubbing it with isopropyl alcohol. This will increase adhesion by about 100X.


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