UT3 nozzle doesnot print same thickness on the build plate

[UoS2018 0]

currently, I am using UT 3, the nozzle does not print the same thickness on the build plate in one go. front side thicker skirt and rear side thinner skirt, what is wrong with that, does anyone know that?

 

Thanks

[yellowshark 153]

My immediate thought is that you have a levelling difference between the front and rear of the bed. If by "thicker" you mean "wider" then the front of your bed is closer to the nozzle than the rear. Either raise the rear or lower the front so that they match

[UoS2018 0]

yes, I tried to raise the screw to level up and down, but it seems not working in this way, also, you know before the actural printing, the two nozzles are active the level, the BB nozzle should be locked and raised up, but it did not. I dont know why, by the way, I updated new fireware.