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How to replace a hotend thermistor (XL Single-Tool)

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How to replace a hotend thermistor (XL Single-Tool)

How to replace a hotend thermistor (XL Single-Tool)
Relevant for:
Last updated 8 months ago
How to replace a hotend thermistor (XL Single-Tool)
 Difficulty
Moderate
 Steps
15
 Available languages
ENCSPLDEESITFR
Introduction
Introduction
This guide will take you through the replacement of the hotend thermistor on the Original Prusa XL.
This manual is for a single tool only.
Hotend Thermistor NTC 100k is available in our eshop.
Note that you have to be logged in to have access to the spare parts section.
Tools necessary for this chapter
Tools necessary for this chapter
Tools necessary for this chapter
For this chapter, please prepare:
TX 6 Torx key
TX 8 Torx key
A cardboard box for use as a heatbed protection during the assembly. Hint: use the Prusament box.
Small brass brush for cleaning the nozzle
Filament unloading
Filament unloading
Filament unloading
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.
Cleaning the hotend
Cleaning the hotend
Cleaning the hotend
Cleaning the hotend
WARNING: The hotend and heatbed are very HOT. Do not touch these parts!!!
次のステップでは、ヒーターブロックとホットエンドをフィラメントのゴミからきれいにしておく必要があります。
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.
Preparing the printer
Preparing the printer
Preparing the printer
Before you proceed, it is recommended to protect the heatbed.
Make sure the heatbed is cooled down to ambient temperature. Place the empty cardboard box approximately to the front center part of the heatbed.
From the rear side of the printer, turn the power switch OFF (symbol "O").
Disconnecting the hotend
Disconnecting the hotend
Disconnecting the hotend
Open the dwarf-cover-door to access the electronics board.
Each connector has a safety latch. It is necessary to press the latch before disconnecting. Otherwise, the connector may get damaged.
Disconnect the hotend heater cable.
Disconnect the hotend thermistor cable.
Leave both cables free for now.
Removing the hotend
Removing the hotend
Removing the hotend
Removing the hotend
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.
Removing the thermistor
Removing the thermistor
Removing the thermistor
Using a TX 6 Torx key, loosen and remove the grub screw.
Pull out the thermistor out from the heaterblock.
Inserting the new thermistor
Inserting the new thermistor
Inserting the new thermistor
Insert new grub screws and screw them. A few turns are enough for now.
Insert the new thermistor all the way into the heaterblock.
Using a longer side of a TX 6 Torx key, gently tighten the grub screw while keeping the thermistor in position.
Tighten gently but firmly. Using more force can cause fatal damage to the thermistor.
Inserting the hotend
Inserting the hotend
Inserting the hotend
Inserting the hotend
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.
Connecting the hotend
Connecting the hotend
Connecting the hotend
Connecting the hotend
Connect the hotend heater to the upper slot on the electronics board.
Connect the hotend thermistor to the lower slot on the electronics board.
Close the dwarf-cover-door.
Remove the cardboard box from the heatbed.
Checking the temperature
Checking the temperature
Checking the temperature
To check if everything is working, go to Preheat -> PLA and on the main screen check if the hotend temperature is increasing.
WARNING: The hotend and heatbed are very HOT. Do not touch these parts!!!
Snap the x-carriage-cover back onto the X-carriage. You must feel a slight "click" to ensure the cover fits on the part.
That's it
That's it
Easy, right? Good job. You just successfully replaced the hotend thermistor on your Original Prusa XL.
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