Household 3D printers will, in practice, hamper innovation both from companies and individuals. Firstly, individuals will still be faced with the large barrier to entry of lacking sufficient expertise to produce much of what they want. Any “flow of ideas” that may arise will only be composed of low-quality designs. Secondly, individuals will have less incentive to innovate when the market is out of control and free designs are floating all over the internet. Any attempt at differentiation is impossible.  Thirdly, and more importantly, the problems with copyright law once 3D printers are domestic will deter both companies and individuals from innovating. Revolutionary products require effort and knowledge to design: they will not be created without a profit incentive.