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[Closed] Thermistor lead replacement  

New Member
Thermistor lead replacement

I had a catastrophic failure with PLA blob around the hotend. I screwed up fixing it and damaged the thermistor leads: ripped one out, all but on the second.

Can this be repaired? How? Can I just solder the leads in? Pictures of a good hotend would be appreciated.

If not, any suggestions on a replacement hotend? I'd like it to be at least as good as the original.

Posted : 13/06/2017 12:47 pm
Re: Thermistor lead replacement

Soldering will not work due to the heat.

Replacement thermistor:


Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…

Posted : 13/06/2017 1:00 pm
New Member
Topic starter answered:
Re: Thermistor lead replacement

Thank you. I atctually went with a US supplier of the same part. It gets delivered to me quicker.

Posted : 13/06/2017 3:15 pm
Trusted Member
Re: Thermistor lead replacement

I had a self test fail with 'heater/thermistor' error - I have ordered a new thermistor from Prusa and paid the same price in postage as the replacement part and then saw the message about getting it from 🙁

I guess you would have to ut the plug off and resolder the leads, but what about the heat on the solder?

If this does not solve the problem can I get the heater from them? It is advertised as 12v 30w and I thought the Prusa heater was 40w?

The current heater does get hot (ouch) so I am hoping it is alright, same problem, big melted blob got the thermistor leads but I managed to clean everything up by soaking the block in acetone (I got the heater and thermistor out first)

Hopefully the silicone socks I have also ordered might prevent a re-occurance


Posted : 03/07/2017 1:27 pm
Active Member
RE: Thermistor lead replacement

I am going to splice in a replacement thermistor.
Does it matter which wire goes to which pin?

Posted : 18/04/2020 5:57 pm
Illustrious Member
RE: Thermistor lead replacement


the thermistor is a changing resistor. polarity does not matter.

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen.

Posted : 18/04/2020 6:34 pm