For very simple pressure fed engines (which this appears to be) it's actually cheapest to additively manufacture (3D print) engines as you can integrate the coo

For very simple pressure fed engines (which this appears to be) it's actually cheapest to additively manufacture (3D print) engines as you can integrate the cooling channels. On engines like Raptor you have pumps, which notably need to move so while you still use 3D printing (Raptor uses a ton) you can't print it in a single piece. 3D printing is already an industry standard and nothing this company did with relation to its engine manufacturing is anything special. They also appear to have lied that no post-manufacturing qualification is required.