I have been trying to see if I can fool FLUX to print in 2 or more colors. The picture shows the results, although not perfect, the process is very close to working but manually only. I thought by loading a g-code file generated outside FS-v0.3.4, I could fool the filament detector. I created the g-code for a 10mm side cube, with no fill inside to see how clean the color change would be. I inserted a G4 "pause" command to be able to pull the filament by hand and change to a different color. As soon as the filament is out, the error message comes up but once the filament is changed, hitting Retry button in the error window a few times forces the machine to continue to print from where it was stopped. I inserted the G4 just before a new layer but if there is some infill, changing the filament during the infill would probably give cleaner color transitions on the outside perimeter. I tried to push out by hand all the filament before continuing and as it can be seen, I almost succeeded in my 2nd try. By the way I also tried M0 and M600 commands but I don't thing the present FS-v0.3.4 has those commands incorporated. One more note, just before the G4, I give a G1 command to move the toolhead away from the print.