ESA - 3D-printed storable-propellant rocket engine design tested

The recent hot firing of a full-scale rocket thrust chamber assembly takes us a step closer to proving 3D-printing for an engine design destined for rocket upper stages, in-orbit transportation applications (kick-stages and space-tugs), microlaunchers, and exploration spacecraft such as a lunar lander and ascent stage on the Moon.

German Aerospace Center (DLR) Designs Liquid Rocket Engine Injector with 3D Systems

ESA - Propulsion activities

ESA - New test facility for Ariane 6 upper stage

Selected results of hot fire tests of hybrids using 98% HTP and HTPB as

Australian engineers 3D print rocket engine in just 4 months - 3Dnatives

3D-printed rocket fuel - Aerospace America

Rocket Factory Augsburg talks reusability plans and 3D printing

How do Solid Rocket boosters withstand the temperature of their exhaust? - Quora

Thermo-Structural Analysis of a Rocket Engine Thrust Chamber

Test Stands – Beyond NERVA

3D Printing and the Future of Space

Aerospace, Free Full-Text

4.0 In-Space Propulsion - NASA