Thank you for your assistance. Your guess was spot on - the ABS was in the left nozzle.
The Robox had ABS loaded on reel 2 and neither the eject filament button nor the "Eject stuck filament" routine were able to unload the Croma green Robox ABS filament. However it was still printing well with the still loaded ABS.
I placed a large print on the right side of the printbed and while it printed the second layer I pushed the eject button on the printer to change filament. The print head stayed on the right side and unloading the ABS filament worked over there. Nevertheless it was a scary experience.
Now I am printing Colorfabb Ngen. Loading and unloading is not a problem with Ngen PETG.
Please consider moving the print head to the right side of the x-axis for the standard unload filament routine. I would also like to suggest to increase the nozzle temperature for unloading filaments. On my Replicator 2 I need at least 200 degrees Celsius to unload ABS filaments. Otherwise I have to rip the filament out of the hotend with brute force.
The freshdesk support article Pete mentioned in his posting is for the single material head. It should be updated for the new dual material head with the additional gcode commands to heat heat up the left or right nozzle.
Posted : 11th January 2017 7:20 pm