WASHINGTON — The world's first 3D-printed rocket is scheduled to blast off from Florida on Saturday on the maiden flight of an innovative spacecraft billed as being less costly to produce and fly. Liftoff of the rocket, Terran 1, had been scheduled for Wednesday at Cape Canaveral but was postponed at the last minute because of propellant temperature issues. The new launch window for the rocket built by California aerospace startup Relativity Space to put satellites into orbit is from 1 p.m. to 4 p.

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