They are both about 3d printing rocket engines, but it's a bit of comparing apples and oranges.
- The linked article is about improving the speed of manufacturing with 3D printing. The linked article claimed that there was no need for any post-fabrication qualification and there was much skepticism in that claim. But they did perform a sub-orbital launch.
- This article is about improving speed in the design cycle. The article mentions after printing it was "post-processed at the University of Sheffield and prepared for the test". Here there is skepticism of the actual performance (namely efficiency) of the engine for practical purposes.
3D printing rocket engines themselves in and of itself is not a new thing. Rocket Labs has 3D printed rocket engines and has been flying them since 2018
- The linked article is about improving the speed of manufacturing with 3D printing. The linked article claimed that there was no need for any post-fabrication qualification and there was much skepticism in that claim. But they did perform a sub-orbital launch.
- This article is about improving speed in the design cycle. The article mentions after printing it was "post-processed at the University of Sheffield and prepared for the test". Here there is skepticism of the actual performance (namely efficiency) of the engine for practical purposes.
3D printing rocket engines themselves in and of itself is not a new thing. Rocket Labs has 3D printed rocket engines and has been flying them since 2018