Rockets With Printed Parts

In 2023, a company called Relativity Space launched the first rocket ever made mostly with 3D printers! It was called Terran 1. Their factory can print an entire rocket in just 60 days. Compare that to traditional rockets, which can take years to build — 3D printing is changing everything about how we reach space.

By the end of this lesson you will be able to: • Explain what a 3D printer does and how it builds objects. • Describe why printing rocket parts is useful. • Name at least two real 3D-printed rockets or rocket parts. • Tell one big advantage of 3D printing over older ways to make things.

A 3D printer builds objects layer by layer — like stacking hundreds of thin pancakes until they form a solid shape. A regular printer squirts ink onto flat paper. A 3D printer melts plastic, metal, or even concrete and stacks tiny layers on top of each other until a solid object appears. The result can be almost any shape the computer tells it to make! For rockets, special 3D printers melt metal powder with a powerful laser. This is called Selective Laser Melting, and it can create rocket parts that are stronger than ones welded together by hand.

Building rockets the old way takes thousands of individual parts bolted or welded together. Every joint is a place where something could break. 3D printing can make a whole rocket engine chamber in ONE piece instead of hundreds. Fewer parts means: • Fewer places for things to go wrong • Much faster to build (days instead of months) • Less money to spend • Easy to change the design — just edit the computer file!

Several rockets now use 3D-printed parts: • Terran 1 (Relativity Space, 2023): 85% 3D printed — the highest percentage ever for a rocket! • SpaceX Starship: Engine parts including the SuperDraco thrusters that help guide landings are 3D printed. • Rocket Lab Rutherford Engine: Almost entirely 3D printed and can be made in just 24 hours. • NASA Artemis SLS: Rocket engine nozzles include printed copper parts that must survive extreme heat without cracking.

Rocket parts must survive incredible heat and pressure. Special metal powders are used: • Inconel (a nickel-iron alloy): Handles over 1,000°C — perfect for engine parts near the flame. • Titanium: Very strong and lightweight — used for fuel system parts. • Copper alloys: Excellent heat conductor — used for cooling channels inside engine walls. These metals start as fine powder. The laser melts and fuses the powder, building up the part one razor-thin layer at a time.