ABS is a special type of filament used in 3D printers to make durable and heat-resistant parts that will hold up in harsh conditions.

ABS was chosen as the main material for the engine as it was the most well-balanced among the three main factors when compared to other materials. These three factors are Durability, Cost, and Availability. An example of another material that I could have used for this project would be PLA (Polylactic Acid), and very cheap and available material, however, this material is only good for early prototyping where the parts are not planned to last, as it is fragile and easily snaps.

ABS makes up around 70 percent of the engine material with it making up the impeller, the intake, and the main body and diffuser.

Aluminum is one of the cheapest and most common metals used nowadays as it is relatively durable when used right and can cost very little. 

This material was picked to make up the shaft, the combustion chamber, and the exhaust cone making up the other 30 percent of the engine as these would be the parts that endure the highest temperatures and most extreme conditions inside the engine. For instance, the combustion chamber and exhaust cone are responsible for maintaining the flame inside the engine, keeping it burning continuously and as hot as possible to provide the highest thrust, while the shaft must be sturdy and strong to provide a rigid foundation for the impeller to rotate on.