Do you still get the hot smell ?
Please let me know, if you still need help on this issue.
Thanks for the reply. See, honestly speaking, it is very difficult to say about the exact fault without inspecting the printer parts physically. But, from my experience I can say that, the problem is caused due to overheating of the fuser unit, due to that you are getting that smell and due to the same reasons, it seems one side of the roller was damaged, as the top part of the rollers are covered with rubber layer for better gripping. If you want to solve the problem completely then, you have to replace the fuser unit and the rollers.
I have to find out that, but generally these parts are not user replaceable. So, if you have previous experience in printer repairing then, you can try to replace these parts at home.