After some students used the printer (Creality Ender 3 V3) for a project, I found out the next day that the extruder upper joint (the one that looks like a pneumatic quick connect push air fitting) was out of its housing (pictures attached, the first one is the fitting and a black ring that goes below it, the second shows the fitting sitting on its housing but not completeley secured).
I though it was threaded but upon further inspection realised that it was ribbed, tried to push it back into its place and it went in a bit but didn’t want to use full force fearing damage on the extruder kit.
Has anyone had this problem before? Do I need to push really hard until it’s completeley seated? How is it usually put into place?
Any help would be appreciated.

