⬢Manually move the X-axis assembly all the way to the front side of the printer.
⬢Move the extruder approximately to the center of the X-axis.
⬢If you have loaded the filament, unload it from the hotend. On the screen, navigate to Filament -> Unload Filament.
WARNING: The hotend and heatbed are very HOT. Do not touch these parts!!!
⬢Remove the filament from the hotend. It is not necessary to completely remove it from the printer. Just a few centimeters (inches) above the extruder.
If you have a Prusa hotend sock on the hotend, remove it.
⬢On the printer screen, go to Control -> Temperature -> Nozzle temperature and set the temperature to 260°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 from the filament residue. Avoid contact of the brush with the hotend cables, as this could cause a short circuit.
⬢When the heaterblock is 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.
If your x-carriage-cover has a hole in it, there is no need to remove the cover. Use the hole to release the hotend.
⬢Remove the x-carriage-cover from the X-carriage.
⬢Hold the hotend with your right hand.
⬢Using your left hand, insert the Torx TX 8 key all the way through the X-carriage until it reaches the grub screw in the extruder. Loosen the screw. Do not remove the screw, a few turns are enough!
⬢Carefully pull the hotend assembly out of the extruder.
⬢At the same time push the hotend cables behind the fan out of the extruder.
⬢Push the hotend cable behind the heatsink fan up to the electronics.
⬢Locate the hole in the heatsink from the bottom of the extruder and insert the hotend nub into the heatsink.
⬢Push the hotend all assembly the way in.
⬢Rotate the heaterblock as in the picture. There must be approximately 35° - 40° angle to avoid damaging the hotend cables.
⬢Maintain the position and using the TX 8 Torx key tighten the grub screw to secure the hotend. Do not use extra force while tightening, it may damage the hotend nub.
⬢Easy, right? Good job. You just successfully replaced the hotend thermistor on your Original Prusa XL.
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