It's best to ask Cura what the terms mean as it will never give you a false answer. It will never lie to you.
To do this put your object into cura and look at it with "slice view". Pick an inner layer with the slider on the bottom right. You can use shift+up arrow to move one layer at a time. The "shell" is the outer perimeters. So the red line is the outer most shell, the green lines are more shell (if you have more than 2 passes) and the yellow lines are "fill".
Experiment with settings.
ALWAYS make sure shell is a multiple of nozzle diameter.
Changing density changes how much yellow infill there is on areas that are not "top/bottom". Top/bottom areas are yellow but they are always 100% fill. top/bottom might not be at the top of your print - it might be in the middle if you have for example a shelf.
Don't mess with infill speed - I strongly recommend you set this to 0.
I don't know what an "air gap" is. Maybe the space between the yellow fill grid?
But change these cura settings and look what happens in slice view.
Edited by Guest
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neotko 1,417
http://my3dmatter.com/tag/perimeters/
Some basics.
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