[IMAGE][IMAGE]I just checked my XPS 15 9510.  Looks exactly the same.  If it's a manufactoring defect then we both have it.  I can compress that small space with two fingers easily.  It certainly doesn't seem to affect function.  I wouldn't have even noticed it if you hadn't brought it up.  Perhaps there is a design reason for it to be that way, but I don't know what that would be.   This laptop has always felt very solidly built IMHO.  I'm very happy with my 9510.  
Is this space between lid and body by design (see attachment)? I don't have this on an older XPS 15 9550, but I suspect it might be intentional, so want to check if anyone else has seen smth similar or knows if this is an issue or not. [IMAGE][IMAGE]
Space between lid and body on XPS15 9510