I built the Primo 2.5 years ago (MPCNC Primo Schneewittchen - Oldenburg, Germany) and it did a great job. But like Dan, I built it too big, so there is a little chatter in the middle. Since I do everything, from engraving tiny earrings to cutting rocket-shelves or Cajons I wanted a CNC that is even bigger than the Primo and would be more stiff.
I might want to go back to the Primo one day, like Dan, and make it smaller, but I think the Lowrider 3 might have been exactly what I was looking for (at least on paper it is). Can tell you more in a few days when it is running (Der Froschkönig - Lowrider 3 in Oldenburg, Germany). 
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