My Flir E4 camera arrived just yesterday and today I plan to investigate if overheating is the reason for my 3d printer (Ultimaker 2) to be unreliable on large

My Flir E4 camera arrived just yesterday and today I plan to investigate if overheating is the reason for my 3d printer (Ultimaker 2) to be unreliable on large prints. Also, I hope to have an insight which parts are getting hot and estimate the best place for a fan.