http://reprap.org/wiki/Print_Trouble...ictorial_Guide

http://support.3dverkstan.se/article...shooting-guide

https://www.simplify3d.com/support/p...oubleshooting/

https://all3dp.com/common-3d-printin...eir-solutions/

https://ultimaker.com/en/support/vis...shooting-guide

...

I'm sure your google-fu is adequate.

http://manual.slic3r.org is as good a place to start as any.