I have the Sigmax R19 from BCN3D and the single extrusion went really well. However i´m testing right now the dual extrusion with PLA and PVA as support. Now the Printer prints the first layer really well and clean. But the second layer and every other layer is a big problem. The printer starts printing as soon as the Nozzle is on its way to the modell. An now there are long strings at the side of my modell.
I attached some photos where you can clearly see my problem.