[newnewpdro]

Does 3D printing make a difference here?

[qdonnellan]

Potentially! Actually Relativity Space [1] is attempting to do just that (I don't believe they manufacture aerospikes, but I don't see why they couldn't).

[1]: https://www.relativityspace.com/

[EDIT] If you're reading this and you work at Relativity, I'd love to know if you actually 3D print your nozzles...