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Bug: Offset (layer shift) between first and second layer when printing PLA + PVA
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· Bug: Offset (layer shift) between first and second layer when printing PLA + PVA
90% of the time this is a loose pulley. First figure out if it slipped in X or Y. Then tighten all 6 pulleys (SIX - not four). on that axis. The most likely problem pulley is the one on the stepper. You should be able to get it with a long handled hex driver (it's okay to push the print head around to get access to the set screw).
Tighten the hell out of those pulleys. If you are using an L shaped allen wrench with the short arm for torque it should hurt your fingers a lot after. A lot. Tighten it so much you are scared. The steel shaft should be twisting slightly.
If you don't believe me you can mark the shaft and pulley with a sharpie such that after a layer shift you can see if you are right or I am right. Sometimes the problem is high friction or overheating stepper driver (is it above 20C in the room with the printer?) but overheating stepper driver problems usually occur after an hour of printing - not just at the start. Push the head around with your fingers to feel the friction. If one axis seems worse then oil it. Oil them anyway. Just a tiny bit of oil. Too much oil is bad. One drop on each of the 6 steel rods in the gantry. Any light oil is fine. Don't use WD40.
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gr5 2,333
90% of the time this is a loose pulley. First figure out if it slipped in X or Y. Then tighten all 6 pulleys (SIX - not four). on that axis. The most likely problem pulley is the one on the stepper. You should be able to get it with a long handled hex driver (it's okay to push the print head around to get access to the set screw).
Tighten the hell out of those pulleys. If you are using an L shaped allen wrench with the short arm for torque it should hurt your fingers a lot after. A lot. Tighten it so much you are scared. The steel shaft should be twisting slightly.
If you don't believe me you can mark the shaft and pulley with a sharpie such that after a layer shift you can see if you are right or I am right. Sometimes the problem is high friction or overheating stepper driver (is it above 20C in the room with the printer?) but overheating stepper driver problems usually occur after an hour of printing - not just at the start. Push the head around with your fingers to feel the friction. If one axis seems worse then oil it. Oil them anyway. Just a tiny bit of oil. Too much oil is bad. One drop on each of the 6 steel rods in the gantry. Any light oil is fine. Don't use WD40.
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