3D Printing Basics: When things go wrong! (Ep9)

Thanks to Prusa Research and Prusament for supporting the series http://go.toms3d.org/prusa
What are the issues to look out for in your 3D prints? Let's find out!
Check out the E3D Volcano series https://e3d-online.com/products/volcano-hotend

Relevant guides (some of these are... old!)
Extruder calibration https://www.youtube.com/watch?v=YUPfBJz3I6Y
Nozzle cleaning https://www.youtube.com/watch?v=g8uvh6kvr54
Octoprint setup https://www.youtube.com/watch?v=MwsxO3ksxm4
PID tuning https://www.youtube.com/watch?v=APzJfYAgFkQ
Filament basics https://www.youtube.com/watch?v=unmvWkfpmRE&list=PLDJMid0lOOYnRCAdbFfzECor3EbqF8euw&index=14&t=0s
Bed leveling basics https://www.youtube.com/watch?v=AaF28dnDgKA
Printer box https://www.youtube.com/watch?v=M7eW4ZqKe4Q
Jerk/acceleration/speed tuning https://www.youtube.com/watch?v=7HsIZuj9vOs

00:00 When Things go wrong
01:06 What does a good print look like?
03:31 Extrusion Problems
03:48 Too little - too much Filament
05:20 Clogging
06:10 Blobs and Stringing
06:57 Temperature Problems
07:49 Bed Adhesion and Warping
09:27 More Temperature Issues: Curling, molten down Details, Gaps
10:02 Mechanical Issues
12:52 Overtuning