Additive manufacturing (AM), also known as 3D printing, is revolutionizing manufacturing. In contrast with subtractive manufacturing methods such as machining, AM technologies create components directly from a computer model, adding material only where needed. Heat is often an integral part of this process – one that needs to be monitored closely in order to see consistent results. This paper discusses how infrared (IR) cameras can help manufacturers find systematic problems and determine what changes are needed to maintain product quality.