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May '16 - I "own" all three. M2 is hard to get in Europe, must be shipped, but is superior in mechanics and wiring. I would rate these items 9/8 in a 1-10 scale....
Oct '15 - i have ninjaflex here but haven't had the time yet to try. But I can tell you the ROBO R1 here states 7 degrees too much on the extruder. So I print Pl...