On the Ultimaker 3 (extended version) I find it difficult to load the filament into the feeder. Unless I lift up on the pressure control mechanism and push the filament up into feeder, the filament will simply not load. I spend the better part of 10 - 15 minutes getting the material loaded every time. Often the filament will get hung up on the lower edge of the mechanism that holds the bowden tube in place. Sometimes I have to turn the armature of the stepper motor to get the filament into the bowden tube.
I am reluctant in lowering the tension as the filament looks like its knurled similar to photos in the manual..
This is my first 3d printer, and other than the feeder issue, the printer is nearly flawless. I have been able to print extremely complex parts with perfection.... over and over....