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Introduction: Explain how hot end works and when you would want to replace it.

Tools

Step 1: Unload Filament and Remove Print Head

To begin, follow the existing guides on our wiki for unloading the filament and removing the printhead from your machine. Once the printhead is removed, bring it to a workbench to facilitate the replacement process.

Step 2: Cut Zip Ties

Inspect your printhead for a zip tie on the part cooling duct. If your printhead is a newer model with a zip tie, cut it to release the Hotend cables. Older printheads may not have this feature, in which case you can skip this step.

Step 3: Disconnect Heater and Thermistor Cartridge Plugs

Disconnect all heater cartridge plugs and the thermistor cartridge plug from the PCB.

Step 4: Disconnect the Part Cooling Fan

Unscrew the part cooling fan duct and remove the part cooling fan plug connected to the PCB.

Step 5: Remove the Old Hotend

Using a screwdriver, remove the two M2.5 socket head screws on the heat block. Once the screws are loosened, the hotend should be able to wiggle free from the printhead.

Step 6: Install the New Hotend

Ensure that your new Hotend has the four heat break tubes installed, as well as the M2.5 socket head screws. Apply a small amount of Loctite 243 on the socket head screws and insert them into the printhead. Torque the screws to a value of 0.9 Nm.

Step 7: Reattach the Part Cooling Fan

Install the part cooling fan and reconnect the fan cable.

Step 8: Reconnect the Thermistor and Heater Cartridge Plugs

Insert the thermistor plug and the heater cartridge plugs into their respective connections on the PCB.

Step 9: Secure Hotend Cables

If your part cooling fan duct has a cable tie point, use a zip tie to secure the Hotend cables in place.