How to replace a hotend thermistor (MK2S)

Relevant for:

Last updated 4 years ago

Difficulty

Moderate

Steps

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Step 1 Cut 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!

⬢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.

⬢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.

⬢Lay the printer on the PSU side so you have better access to the thermistor.

⬢1.5mm 六角レンチを使用して、ヒーターブロックのネジを外します。ネジを外す際は、慎重に行い、ネジ頭を傷めないようにしてください。

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

⬢Remove the thermistor completely.

⬢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.

⬢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