1 Topic by tonycstech (edited by tonycstech 2017-11-04 04:20:53)

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Topic: Upgrading thermistor need help

I want to upgrade termistor from "insert into a hole" to "screw in to a threaded hole" because it will have better surface contact with the nozzle and give better temperature reading.

I need to know thermistor ohms rating, voltage or what ever parameters i need to know to order a replacement that will work.

I have a problem with the current termistor that i ordered, it reads room temperature for some reasons and does not seem to respond.
Thermistor i use is made for E3D nozzles, not for filastruder SESTOS.

Maybe i need to change some settings in the SESTOS to make it work with the new thermistor ?
Please clarify.

I used
M3 screw-on Thermistor SEMITEC 104NT-4 NTC 100K
From https://www.ebay.com/itm/M3-screw-on-Th … 2749.l2649
And it does not seem to read the temperature. Its always at around 24-25c no matter what.

\thanks !

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2 Reply by os3dp

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Re: Upgrading thermistor need help

I believe you need a Type K Thermocouple.

-os3dp

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3 Reply by tonycstech

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Re: Upgrading thermistor need help

os3dp wrote:

I believe you need a Type K Thermocouple.

-os3dp

"Type K Thermocouple" on ebay returns original thermistor that came with the unit.
But its crap. It fits into a hole and brakes and just not very practical if you ask me.

Would this work ?
I think i have enough room to drill 6mm hole on the side of the nozzle filstruder came with.

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4 Reply by os3dp

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Re: Upgrading thermistor need help

The following are the two type of thermocouples that I've researched in the past.  I disassemble my filastruders so much in testing that I have broken one thermocouple so far and it becomes a pain to get the kapton tape off quickly while not allowing the platic to cool inside the barrel.

https://www.amazon.com/dp/B00EDJYBCW

and

https://www.amazon.com/dp/B0756RCM9C

I haven't tried either of these yet but they are on my todo list.

I like the second one since it would be easier to just remove a screw rather than having to mess with a wrench.  Also it appears that I could just have a 3mm screw and maybe washer to attach it. 

If you do try one of these please let us know.

-os3dp

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5 Reply by elmoret

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Re: Upgrading thermistor need help

The Filastruder uses a K-type thermocouple. A thermocouple is not a thermistor, they are not interchangeable.

There are many types of K-type thermocouple available, some are bare sensors like the Filastruder, some are threaded. The problem with a threaded sensor is that it is necessary to disconnect the cables before being able to unscrew the sensor. The purblem with a lug style sensor is that is is noticably affected by ambient temperatures as compated to a sensor that is embedded in the nozzle. With a bare sensor, one can simply peel off the tape and pull out the sensor.

os3dp - you can remove the tape first, then heat the assembly, remove the thermocouple, and remove the nozzle.

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E3Dv6 All Metal Hotend - the premier 3D printing hotend

6 Reply by tonycstech (edited by tonycstech 2017-11-04 19:14:11)

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Re: Upgrading thermistor need help

Am buying both. I guess the ring one will work better since elmoret said that lug style picks up ambient temperature.
Perhaps because it was not sunk deep enough into the nozzle ?

Ill cut the end of the ring making into a U shape. So that way i can just loose the screw and slide it out instead of getting the screw off all the time.

Ill post my results when i get them.

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7 Reply by elmoret

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Re: Upgrading thermistor need help

By lug terminal, I was referring to the second Amazon link os3dp posted. Lug and ring are two names for the same type of terminal.

Filastruder - the robust, inexpensive filament extruder
E3Dv6 All Metal Hotend - the premier 3D printing hotend

8 Reply by os3dp

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Re: Upgrading thermistor need help

elmoret wrote:

os3dp - you can remove the tape first, then heat the assembly, remove the thermocouple, and remove the nozzle.

I do, it just would be easier to just unscrew the lug type but you brought up a good point with ambient temps affecting the reading.

-os3dp

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9 Reply by tonycstech (edited by tonycstech 2018-02-08 07:05:36)

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Re: Upgrading thermistor need help

Ok i tried them both and they had same issues with their design as well as causing problems with temperature reading (unstable) causing even more issues freezing my extrusion to a halt for months.
I thought i was too cold or too during winter and elements would cool down too quick, but the problem was in the design of those.

These are the two i bought:
http://soliforum.com/i/?Wbbt6Qh.jpg
http://soliforum.com/i/?lfUmXm4.jpg


Both of them (including the enclosed one) i found exact same thing.
http://soliforum.com/i/?ySzpZbn.jpg

In both cases connection was very loose, causing unstable temp reading.

I solved this by cramping my own washers.
http://soliforum.com/i/?0iEfU1O.jpg
WARNING: You must use aluminum washers because they are soft. Otherwise you may damage thermocouple.


That provided solid surface contact and reliable temperature reading.

I can now attach this to the nozzle.

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