Recommendation: There is an alternative nozzle replacement method that requires using a printed replacement tool. This approach is quicker and simpler, allowing you to replace the nozzle directly on the printer.
This method requires printing the Nozzle Replacement Tool. If you do not have the possibility to print the tool, follow the instructions in the next steps.
⬢The Nozzle Replacement Tool part is available for download on Printables.com.
⬢After printing the part, follow the quick guide or video tutorial on the same Printables page.
WARNING: The hotend and heatbed are very HOT. Do not touch these parts!!!
⬢For the following steps, it is necessary to have the heaterblock and the hotend clean from the remains of the filament. Otherwise, it can be difficult to release the nozzle.
If you have a Prusa hotend sock on the hotend, remove it.
⬢On the printer screen, go to Control -> Temperature -> Nozzle Temperature and using the knob set 250°C.
⬢Wait at least 5 minutes. The remains of the filament must be warmed up slightly so that they can be removed more easily.
⬢Using the brass brush, carefully clean the heaterblock and the hotend from the filament residue. Avoid contact of the brush with the hotend cables, as this could cause a short circuit.
⬢When the heaterblock and the hotend are perfectly clean, cool down the printer. On the screen, navigate to Preheat -> Cooldown.
Wait until the hot parts are cooled down to ambient temperature. It takes approximately 10 minutes.
⬢Turn the printer OFF and unplug the power cable from the PSU (Power Supply Unit).
Make sure the printer parts - print head and heatbed are cooled down at room temperature.
Before proceeding any further, it is recommended to protect the heatbed first!
⬢Take off the flexible steel sheet.
⬢Use any cloth or piece of fabric, which is thick enough and cover the heatbed. This will ensure you won't damage (scratch) the surface during the disassembly.
⬢Locate the hole in the heatsink from the bottom of the extruder and insert the hotend into the heatsink.
⬢At the same time, push the hotend cable behind the heatsink fan up to the electronics.
⬢Push the hotend assembly all the way into the heatsink. There should be approximately a 2 mm gap between the heatsink and the brass part of the nozzle.
⬢Orient the hotend assembly so that the HOT symbol on the heaterblock faces forward.
⬢While pushing the hotend assembly in, firmly tighten the lower thumb screw and the upper thumb screw. Avoid pinching any cable between the screws and the heatsink!
⬢Arrange all the cables according to the picture. All cables must be squeezed as close to the extruder body as possible so as not to interfere with the cover in the next step.
⬢Great job! You just successfully replaced the Prusa Nozzle on your Original Prusa MK4.
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