flow rate not constant

[mgadsky 0]

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:

 

 

 

[gr5 2,094]

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[rigs 735]

Speed 30mm/s to 50mm/s but not 10mm/s

[mgadsky 0]

The nozzle was blocked I changed it to new one, two Robert's feeder pieces I printed were broken, I put the original feeder and I am printing again the pieces, thanks so much for the help.