Want to know more of this great option to add dual extrusion to the Ultimaker2? Main project info here; https://magnetic-tool-changer.com/ Questions? ask here; https://ultimaker.com/en/community/48788-ultimaker-mark2-the-smart-dual-extrusion-upgrade I did not manage to get Cura to Z-hop on the travel on this first layer... Use the line width to set the distance between the lines, In the sample I used 0.7 To get the printer to "print" without extruding I used a quick and dirty trick by setting the bed to 25c and the extruders to 40c. The firmware has a protection not to extrude at these low temps.