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  1. BEFORE YOU START ensure the  printer is turned off and  unplugged from the electricity to avoid damage to you and the printer! Turn the back of the printer towards you. Using pliers cut the selected zip ties.
    • BEFORE YOU START ensure the printer is turned off and unplugged from the electricity to avoid damage to you and the printer!

    • Turn the back of the printer towards you.

    • Using pliers cut the selected zip ties.

    • Don't try to remove the spiral wrap yet, it might be wrapped partly inside the cover and you can damage the cables. Wait for the next step!

  2. Using 2.5 mm Allen key release the bolt holding the RAMBO cover door. Unwrap the spiral wrap all the way to the Rambo cover. Unwrap spiral wrap inside the cover and remove it completely.
    • Using 2.5 mm Allen key release the bolt holding the RAMBO cover door.

    • Unwrap the spiral wrap all the way to the Rambo cover.

    • Unwrap spiral wrap inside the cover and remove it completely.

    • Gently take all the cables away from the top opening. Proceed with caution and don't pull hard on the wires.

  3. There are multiple cables coming out from the Extruder,  look for the cable with Yellow/Green heat shrink! Unplug this connector, DO NOT PULL the  cable! Leave the remaining cables (connectors) plugged in. Unplug this connector, DO NOT PULL the  cable! Leave the remaining cables (connectors) plugged in.
    • There are multiple cables coming out from the Extruder, look for the cable with Yellow/Green heat shrink!

    • Unplug this connector, DO NOT PULL the cable! Leave the remaining cables (connectors) plugged in.

  4. Lay the printer on the PSU side so you have better access to the thermistor. Using 1.5mm Allen key release the screw on the heater block. BE GENTLE while unscrewing the screw or you might damage the thread!
    • Lay the printer on the PSU side so you have better access to the thermistor.

    • Using 1.5mm Allen key release the screw on the heater block. BE GENTLE while unscrewing the screw or you might damage the thread!

    • Use the Allen key again and carefully push the thermistor "head" upwards.

    • Remove the thermistor completely.

  5. Carefully insert the new thermistor inside the heater block, check it is aligned properly. Using 1.5 Allen key tighten the screw again. DO NOT USE excessive force or you might damage the thread! Take the thermistor connector and connect it to the RAMBo board.
    • Carefully insert the new thermistor inside the heater block, check it is aligned properly.

    • Using 1.5 Allen key tighten the screw again. DO NOT USE excessive force or you might damage the thread!

    • Take the thermistor connector and connect it to the RAMBo board.

  6. Now it is time to wrap the cables back to the spiral wrap.
    • Now it is time to wrap the cables back to the spiral wrap.

    • Use our guide for the kit assembly and skip steps, which are already done.

    • Start by setting proper position of the thermistor cables Extruder - Step 28

Finish Line

10 other people completed this guide.

Jakub Dolezal

Member since: 02/20/2017

217 Guides authored

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Prusa Research Member of Prusa Research

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3 Members

359 Guides authored

20 Comments

Thanks - helped me to recover from a crash. Now the MK2s ist printing again ….

Christian R. Meier - Reply

Hi Christian, you are welcome. Enjoy your printer ;)

Jakub Dolezal -

Do you happen to know where I can get a thermistor cable? I've been looking, but I can't seem to find one.

James Lewis - Reply

Hi James, unfortunately I don't know. Please try to write on our support info@prusa3d.com.

Jakub Dolezal -

I know it’s been a while since you asked the question, but in case someone else finds this post while looking for the answer…

https://e3d-online.com/thermistor-cartri...

Mahir Abrahim -

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