The following DrVax video explains how to calibrate the extruder on your new 3d printer.   After watching the video you can use the form below the video to calculate your new extruder steps per mm  (the E value):

The following form is used to calculate your new extruder value.

The following Google slide deck has all of the slides from the video:

Calibrating Your Extruder Google Slide Deck

Enjoy.  Let's continue to learn together.