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Few years ago I built Jason Allemann's LuuMa EV3 (LEGO Ultimate Useless Machine) and started taking it with me to local LEGO exhibitions. I found out that it has one structural problem causing frequent failures and in general it does nothing (since it is called "useless" it is not very surprising). So I got idea to modify it into switch that could control external motor. And I also wanted to fix that structural problem mentioned above. Now, let me introduce you LuuMa 2.0 - "LEGO Ultimate UseFULL Machine". It is improved version of original LuuMa EV3 built and programmed by Jason Allemann. His LuuMa didn't have any real use but my version 2.0 works as switch that can control large or medium motor connected to free cable in port D. You can see it in action in video bellow. Building instructions are available at buildinst.cz