I really don't understand the attention Choi is getting with this. After watching her on stage at Techcrunch, and seeing how vague she is with the actual implementation, it's pretty clear to anyone paying attention that she simply painted a printer and pretended to print a makeup pod. My girlfriend even remarked how it looked exactly like a Bare Escentuals pod off the shelf. She basically got all this attention with an idea and no actual implementation.
To me, this would be the same as someone going up on stage and saying they've created a food printer, stuck a Subway sandwich in there and pretended to "print" it. If I were to do that, I'd be laughed off the stage instead of getting so much press and acclaim.
Her ability to convince the world was perhaps because this idea seems simple enough that we just might believe it (although I have to think printing a dye on a substrate you can apply to your face is a VERY hard problem.)
Not that I give much weight to Techcrunch as it is, but it saddens me to see so many other companies that worked so hard and actually built real things get overshadowed by an HBS MBA who built a weekend hack reminiscent of many high school science fairs efforts.