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flow rate not constant

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Hi, I have a UM2, it print little pieces good, but when I try to print something big I have a little holes in the print, the material is not constantly flowing, I am printing ColorFabb XT white, temperature 253, speed 10 mm/s, fan speed 100%, what can I do?? pleas help me.file:



IMG 8988

IMG 8990

IMG 8989


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