Thermistor Parts List/Obsolesence Issue

[aodhan]

Hi all, I had an issue with the Thermistor on my hot end - it broke when I was spreading the legs to go around the strain relief screw. Sad for me. BUT, I noticed that the same resistor was used in the heated bed, so I grabbed that one to finish out the hot end and put off the bed until another day. After I bent this second one and installed it in the hot end, I realized that the leads would not reach the PCB. That's when I noticed they weren't actually the same, despite the PL's saying they were...

Here's the play by play:

On the 71290 (HE280 Complete Hot End Kit) part list, the Thermistor is listed as PN 26141.
On the 84492 (Rostock Max v3 Heated Bed Hardware Pack) part list, the Thermistor is also listed as PN 26141.

Unfortunately, I clearly received two different thermistors.

The thermistor that I received in the Hot End kit had red leads and measured approximately 2-11/32" long (~68.25mm).
The thermistor that I received in the Bed kit had silver leads and was much shorter (it is now installed in the bed, has been trimmed and I can no longer measure it).

After doing some spec diving, I started with what the SeeMeCNC site store said the thermistor part number was (Semitec 104GT-2). Their website (http://www.atcsemitec.co.uk/gt-2-glass-thermistors.html) says that the 104GT-2 is obsolete and you should instead use the NT style thermistors when a direct replacement is available. They did not provide a direct replacement for the 104GT-2.

However, the specification sheet for the NT style thermistors (reference http://www.atcsemitec.co.uk/nt-glass-thermistors.html has a thermistor (104NT-4 R025H42G) that is 100 ohms @ 25C and has a very similar B value. In addition, the length on the NT style specification is 70+/- 2mm. This matches the length of the red thermistor that I received in my 71290 (hot end) kit.

I haven't received confirmation from my support ticket that this is the correct thermistor to use for the hot end, but I thought I'd share this with everyone on the forums and see if there's someone who understands the electrical application and can confirm that this will be a valid replacement.

Thanks and happy building!

-Matt

[Twac1]

Yes it will. As long as they have close to 100 ohms resistance. I broke mine to, just bought a 5 pack off amazon for like 15 bucks. Works great!

[morgandc]

I was very impressed with sales when I called to order a replacement part due to "installation damage". You may want to pick up the phone.

[ido3dprintz]

Broke mine too. Just bought another off the website, didn't think to ask for a replacement since it was my fault. I also bought a 5 pack off amazon but they were the braided wire ones and oh boy was that a bugger to get in the tiny holes on the PCB. Since I was not happy with my soldering performance of said braided thermister, I ended up installing the replacement i bought from SeeMeCNC.

[aodhan]

They confirmed the part number I listed above. Also, if you order any more, they sent me two packs. So, I ordered 4 and got 8. Also, they only charged about $8 for two day shipping and processed my order immediately. I was very satisfied. I'm glad the "excellent customer service" I read about before I bought the printer is ringing true. This is my first printer ever and dove right in.