The past decade has witnessed remarkable advancements in 3D printing or more scientifically called as additive manufacturing. Surprisingly, few comparative psychologists have taken advantage of 3D printing in the design of apparatus. Our paper discusses the advantages of 3D printing, the type of 3D printers (printing technologies) we have found most useful for various applications, offers practical suggestions on how engineers and comparative psychologists can communicate with each other on apparatus design issues and discuss how apparatus design with 3D printing can increase student interest in the STEM field. We first document that comparative/experimental psychologists seldom use 3D printer technology and then offer recommendations on how to increase the use of such technology in the behavioral sciences.