According to the reviews the Robox is a pile of trash, that makes me questioning your recommendations. Do you have the Qidi dual extruder? Is it difficult to setup/calibrate? Btw, the Qidi support told me that you can't print Nylon on it, only PLA, PVA, HIPS and ABS. I don't need something that is plug and play, just something that is easy to use and doesn't require adding parts to make it print properly or soldering something to the mainboard.