I’m using v2.1.0-2018-07-15. I have a test print set up with four hollow cubes. I have each set to a different color, so I would expect the nozzle to purge (print to the artifact) once each layer between each cube. What I am seeing is that the purge happens once, then all 4 cubes print in that color, then the purge happens again and all 4 cubes print the new color so I end up with striped cubes.
I’m attaching my project file and generated gcode.