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Greg. I have now deleted the purge lines and now just use a skirt with a minimum length, or make a brim big enough.

Thank you. The code now works. the typo and wrong keyword must have occurred when editing whil trying to reduce speed of lines for elastic material

10mm_cube.3mf Attached is a copy of the project file and a generated Gcode file. 10mm_cube(1).gcode

I have exactly the same problem. My start code I have used on earlier versions ie 4.9 and earlier and the {settings-key} has been replaced with the correct value into the Gcode. I am using Linux Mint 18.3 Sylvia and hence using the appimage.