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.
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.
⬢Look closely at the underside of the heatsink and find the hole for the hotend assembly.
⬢Insert the hotend assembly tube in the hole and slide the whole thing into the heatsink. Guide the hotend cables loosely outside the Nextruder on the left side.
⬢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.
⬢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!
⬢From the underside, check that the hotend is oriented correctly. It must fit between the cutouts in the X-carriage.
⬢Great job! You just successfully replaced the Prusa Nozzle on your Original Prusa MK4.
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