About this 3D model

If you still don't have a MK7 extruder (and lots of 3 mm plastic haha... :( ) for sure you experienced this problem with the pluger screw in your MK5/6: http://www.youtube.com/watch?v=tflRlH45SOk (before) And this is the *improved* MK5/6: http://www.youtube.com/watch?v=MKfpU7ZJyJo (after) Then, few prints and your perfect presure over the filament gets modified by this vibration. This guide removes all the problem.