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!

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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.

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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.

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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.

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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.

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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

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Finish Line

6 other people completed this guide.

Jakub Dolezal

Member since: 02/20/2017

81,260 Reputation

134 Guides authored

8 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 -

If only it were as easy as shown when your heater block is covered with PLA goo from a print gone horribly wrong. Try as I might, I am unable to get the set screw to loosen, even holding a soldering iron to the tip of my allen key. It just spins out and I fear I have stripped the screw

Terry Goosey - Reply

Yup! You got that right, Terry. Last night my print failed and I ended up with a golf ball of PLA mounted to my extruder. Broke the termistor cable in the process of removing that. After spending hours spent disassembling the E-axis and cleaning it up, I was unable to get the thermistor itself out. Even with a soldering iron on multiple places, the screw nor the thermistor would budge. Now I fear I’ll be replacing the whole hot end instead of just the thermistor.

I wish that blue cable was protected better somehow.

Cliff Miller -

I might get myself this upgrade kit, provided I can get my heat sink out. It’s not much more than the cost of the thermistor.

https://e3d-online.com/v6-block-sock-kit

What a stupid 5-minute edit rule. I had to post a new comment because I was 30 seconds too late.

Cliff Miller -

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