I have been seeing a lot of posts of people removing shell and asking "what's wrong with my print."

To show the difference, I forced my printer to under extrude, then another clean print of shell removed, and finally a 3rd print of both. To show the examples and difference between a setting and an actual hardware under extrusion.

I hope this helps some people debug the difference, as it was actually a pain in the ass to force a failure.