Maiden firing of the world’s first spacecraft thruster with a 3D-printed combustion chamber and nozzle, commencing a hot firing campaign which lasted more than an hour, including 618 separate ignitions. The prototype was produced and tested at the Airbus Defence and Space facility in Lampoldshausen, Germany, through an ESA project called Additive Manufacturing Technologies for Advanced Satellite Thrust Chamber, AMTAC. The hot firing campaign took place on 5 May 2015 and included a single burn of 32 minutes, during which a maximum throat temperature of 1253°C was attained. The campaign demonstrated that performance comparable to a conventionally-produced platinum thruster can be obtained through additive manufacturing.