If the printer does not extrude either of the two materials during the material loading or printing, the respective nozzle may be blocked and needs to be replaced. Also, if you notice burn marks on the model or there are material deficiencies in the model or the support material, either of the nozzles requires replacing.
Opening the Front Door
Open the front door.
Initiating the Hotend Maintenance
From the menu select “Maintenance” -> “Hotend Maintenance.” The printer will now move the extruder towards the front.
Nozzle Cover Removal
Remove the nozzle cover.
Use the hotend maintenance tool to keep the hotends from moving and unscrew the nozzle counterclockwise using the nozzle key (when viewed from below). Removing the nozzle should take place while the extruder is still hot. When the nozzle is loose, take it out using pliers and follow the instructions from the printer display panel.
Removing Material Remains
Remove the material remains from the hotend using pliers.
Use the hotend maintenance tool to keep the hotends from moving, install the new nozzle in the hotend and screw it clockwise using the nozzle key (when viewed from below).
Nozzle Cover Installation
Place the nozzle cover on the nozzle and follow the instructions from the display panel.