> I do wonder if almost all of their expertise was used for the first three stages(and they are not 3d printed)? Maybe this helps: https://www.isro.gov.in/Tech

> I do wonder if almost all of their expertise was used for the first three stages(and they are not 3d printed)? Maybe this helps: https://www.isro.gov.in/TechnologyTransfer.html https://www.isro.gov.in/TechnologyTransfer.html