Relativity Space to Launch World's First Fully 3D-Printed Rocket Tonight.

Relativity Space will attempt to launch its Terran 1 rocket, composed of about 85% 3D printed parts, for the third time on Wednesday evening from Florida. The company hopes to eventually additively manufacture as much as 95% of its rockets. The test flight, named "Good Luck, Have Fun," will carry no customer payloads and overall success is unlikely. Relativity is pushing boundaries with its methane-fueled booster, and the biggest test is whether the 3D-printed structure can withstand the dynamic pressure of ascent through the lower atmosphere.