So here we have a NASA employee saying "we can't do it because the technology isn't already there" instead of "let's make this work". What a perfect example of

So here we have a NASA employee saying "we can't do it because the technology isn't already there" instead of "let's make this work". What a perfect example of the past 30 years of the US space program. By the way, being in space can be a significant advantage for 3d printers printing metallic components. Not that you care, since you can't buy it off the shelf yet, and anything that hasn't been done can't be done.