I have been experiencing low quality prints since I received the ultimaker 2.
Below are the pics which compare the quality between two robots: robot (blue) is printed with my printer and the robot (red) is printed with another ultimaker 2.
My assumption for the defects is the displacement of rods (both front and rear), which can be seen below.
The manual movement of extruder in xy axis seems to be quite challenging, especially for x axis, which supports this assumption.
Any advise on possible solutions will be greatly appreciated.