Hello, I just received my E3D v6 yesterday. I assembled it following the instructions to the letter. I have a 3.0mm direct drive version. I can't seem to get it to print anything at all without jamming. I've tried printing ABS and PLA at 50mm/s and can't get it to work. I have never had these issues with my extruder using a j-head. What's the deal? How can I fix this? Even pushing filament through by hand seems really hard.