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Hi Labern i check the pulleys they didn,t slip Used a extra cooling fan on the steppers problem solved many thanks

Hello there, I have a UltiMaker Original Plus and i''m having problems during printing. During printing, after approx. 1 hour printing the y coordinate is displacing. I have checked all the axis and pulles and this doesn't cause the problem. Does anyone know's what causes this problem and how to solve it? I hope to hear from you.