[milesvp]

I think you may he missing the parent's point, which is he's using the printer to speed up his design loop. This has heen one of the biggest driving forces I've seen in the commercial use of 3d printers. Sure you can outsource your 3d printing to get much better and higher volume printing, but when you're designing you don't need volume, and often don't need quality either. Quick turn around often is key in design work, and having an in house printer can really reduce total turnaround time.

[goty2]

I am disagreeing with the parents point (or not really because they were talking about doing it as a hobby, which is great).

Yes, you can do design prototype revision A, B and C, then do production prototype A, B and C, and finally production version A, B and C. But then you have spent a significant amount of time and money refining prototypes and adding features. That forces you to large production runs with huge risk, because you have already made the investment. What I am saying is that you should just make the production prototype with less features and ship that. Because that is how you go to market quickly, which is usually the larger point of such development.

This is also why Shenzhen wins over hackerspaces (which are also great btw) but that is another story.