Shame on the author of that article (Cory Doctorow) for such a misleading headline! A "3D printed laptop!" That's what got my attention! But you read into the article and the truth comes out. They are talking about a 3D printed "laptop casing". There's a HUGE and significant difference in printing out a case and a whole laptop. "Attention to detail", Cory! That said, a computer on a card is a great idea IF it has the power/speed and graphics and I/O communications we desire, takes tiny sips from the battery and does not generate a lot of heat.
