⬢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.
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.
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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