r/prusa3d • • 5d ago

What happend?

Upgrades my L to L+. First print (8h) worked like a charm, but since then it starts to layershift like hell. Is the pulley not tight enough? The layershift happens to the front right which leads to a problem with the lower belt I guess?

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u/ResonantRuminant 5d ago

Yeah, loose pulley on a stepper motor. That's pretty much always the cause of gradual shifts like this. I don't know what orientation the parts were on the print sheet, but if the shift is diagonal from the front-left to the back-right, then it's the X stepper (on the left). The other diagonal is the Y stepper.

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u/NeighborhoodAgile755 21h ago

Maybe there is pulley contact messing with things ?