The hotend is an essential part of the heating system, which consists of an aluminum block and a heater and thermocouple. It is responsible for heating and melting the material as well as for ensuring the proper temperature of the material during the whole printing process. Sometimes the hotend can become clogged with material residues and it cannot be mechanically cleaned. A blockage inside the hotend can make it impossible for the extruder motor to load the material and you can hear clicking sounds before and during the printing process. Therefore, when you encounter problems with material extrusion or your prints are incomplete, inspect the hotend and check if it is not clogged. If you cannot clean the hotend or it has become considerably worn (along with the PTFE tube), replace it according to this manual.
|Before replacing the hotend, make sure that the nozzle is not clogged with material remains.|
|The following manual shows the M200 Plus repair work. For the M300 Plus, these procedures are the same.|
Unloading the Material
To unload the material, open the Tools menu and select “Material” and “Unload material.” Wait until the extruder heats up and select “Continue” to confirm.
To complete the procedure, remove the material from the endstop placed at the back of the printer.
Unplugging the Power Cable
Turn off the printer and unplug the power cable.
Wait until the printer – especially the hotend – cools down.
With a 1.5mm Allen key loosen the two screws that secure the hotend and remove the hotend from the extruder.
Heater and Thermocouple Removal
With a 1.5mm Allen key loosen the two screws that secure the heater and thermocouple in the hotend. Then remove both the heater and the thermocouple.
Heater and Thermocouple Assembly
Insert the heater and thermocouple into the new hotend and firmly tighten the two screws (using a 1.5mm Allen key).
Insert the hotend into the extruder and tighten the two screws that secure it (using a 1.5mm Allen key).
Plugging the Power Cable
Plug the power cable in.