Prusa i3 MK2S KIT - R Eplacing; C Hanging T He N Ozzle

If filament is not extruded from a nozzle (or in very small volume), first check the extruder fan
is working properly and that the temperature is set correctly (PLA 210 °C; ABS 255 °C, HIPS
220 °C, PET 240 °C). Also check that the filament was correctly loaded into the extruder.
If the filament pours out at least a little, check the direction. If it swirls and goes up to the
hotend you need to clean the nozzle.
First you have to move the extruder to the rightmost position, out of the way of the heatbed,
to reach the nozzle from below.
Heat the nozzle according to filament you want to print from, load the filament and put a
bundled acupuncture needle (0,3-0,35 mm) into the nozzle from below - between 1 and 2
cm deep.
Choose Load filament option from the LCD menu and check if filament is extruded properly.
Put the acupuncture needle into the nozzle again and repeat these steps a few times more.
When the filament is extruded properly, the nozzle is clear.
12.4 Replacing / changing the nozzle
Preheat the nozzle (LCD menu -> Settings -> Temperature -> Nozzle) and set the
temperature to at least 200°C. Heating the nozzle is crucial for removing the old nozzle and
putting in the new one.
1) Move the extruder body upwards to get to the nozzle end (LCD menu -> Settings ->
Move axis -> Move Z -> Set the height by rotating the LCD knob and then confirm).
2) Unscrew the screw on fan mouthpiece and the two screws on the print fan and
remove both parts (Pict. 30, part 1).
3) Remove the two front screws on the nozzle fan (Pict. 30, part 2).
4) Unscrew the two screw holding the extruder cover (Pict. 30, part 3). Even though
the nozzle itself is accessible directly, we recommend to take the extruder cover to
get access to the heating element.
5) Now the whole nozzle body is accessible (Pict. 30, part 4).
6) Hold the heating element with a spanner (size 17) and unscrew the nozzle (Pict. 30,
part 5). Be careful, the nozzle is still hot!
When the new nozzle is inserted, tighten it while the nozzle is preheated. While tightening do
not forget to hold the heating element with the spanner. Re-assemble the extruder, insert the
filament and you are ready to print.
Be careful, the nozzle is hot during this whole process and can cause burns!
Be careful around the hotend thermistor leads, you can break them easily.
Be careful and don’t apply force to the nozzle or heater block, you can bend
the heatbreak easily.
It is a good practice to run 6.3.9 First layer calibration after changing the nozzle!
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