The body of AOTM models are made of ABS plastic, the same durable stuff as popular children's building blocks and many other hard use items. We manufacture our ABS using 3D Printing technology. This lets us make really complicated low production run parts. For example, the Standard Ordnance Training Set (SOT) has 144 engineered parts, all produced on the 3D printers. By using this method, we can put all of our resources into the design process instead of worrying about the costs of setting up for production.
For other parts, such as springs, we use industrial-grade high quality components to make sure our items continue working for a long time.