[How to determine the location where the 3D printer stopped feeding material.]

I have another problem with the print. It started okay but about 3/4 of the way, the print started to distort and was no longer uniform. Even the color is lighter. Any thoughts?

[How to determine the location where the 3D printer stopped feeding material.]

 I need assistance with my Ultimaker2 printer. I had about 3 hours left on a 40 hour print and the feeder cylinder on the stepper motor came off. I was away from the printer when this happen and when I came back the nozzle was about .5 inches above the plastic part. I paused the printer and would like to know how I can go back and pick up where it left off. Is there a way to access the NC code from the printer? What options do i have? 

Is there something in Cura that will help?

 

Any feedback is appreciated. 

Thank you.