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Of course, it's just a matter of time before 3D printers -- and the free designs at Thingverse -- run into legal challenges. Can you print your own replacement Lego pieces? What about a new switch to control the light in your refrigerator? Will consumers be allowed to print their own versions of patented products, circumventing the costly replacement part circuit offered by manufacturers? Right now, there aren't enough 3D printers and 3D printer hobbyists for these questions to matter. But in five or 10 years, a legal showdown seems inevitable.(MoneyWatch) One of the great investing anomalies, and a great frustration for me, is that the evidence against active management and for indexing (or passive investing) is so overwhelming, yet the majority of investors keep playing a loser's game. I offer three explanations for this phenomenon.