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E3D v6 thermistor strategy?  

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dionhouston
(@dionhouston)
New Member
E3D v6 thermistor strategy?

OK, so weird title. 

Recently I did a large print that slipped off the bed, which broke the thermistor wire AND gummed up both the little grub nut holding the thermistor and both sides of the cartridge. 

Wish I could say it was the first time, but no.  And frankly, I don't really need help on fixing it - I know I just have to either get things melted and the thermistor pushed out or take off the whole heater cartridge and replace it.

Guess what I'm asking -- is  there a better way - either a better thermistor that doesn't break so easily, or some other tip or mod that's helped make this easier?  

I've replaced one too many heater blocks over the years... 🙂

Edit: Guess I should say I have a MK2.5S but I think almost (if not all) Prusa printers have E3D v6 hot ends...

This topic was modified 11 months ago by dionhouston
Posted : 26/11/2020 9:15 pm
JoanTabb
(@joantabb)
Moderator
RE: E3D v6 thermistor strategy?

The Mk0 and Mk1 printers did not have E3D V6 hot ends and the mini, does not have a V6 hotend

In the picture below, the E3D lite6 is the sort used in the Mk1 printer, Note that the PTFE tube goes all of the way to the back of the nozzle, similar to the Mini Extruder, this limits the maximum print temperature 


regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 27/11/2020 8:41 pm
cwbullet
(@cwbullet)
Illustrious Member
RE: E3D v6 thermistor strategy?

If you print only PLA, the lite is fine.  anything over 230 might lead to PTFE degradation.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 27/11/2020 8:51 pm
dionhouston
(@dionhouston)
New Member
Topic starter answered:
RE: E3D v6 thermistor strategy?

Thanks for the responses... And definitely shows why one mustn't assume 🙂  I've been using E3D v6 (heavy) for years -- I even modded my first Monoprice Select Mini to use it.  And when it switched to a thermistor cartridge, initially I thought that was a great idea.  But that little grub nut 🙂

I got a suggestion to use the silicone sock that comes with it as hopefully, the filament mess will get on it instead of the hot end.  Seems like a decent suggestion - are there gotchas to doing so with the MK2.5S/MK3S?

My go-to filament is PETG.  Almost everything I print uses it. So seems like the lite is out.

Thanks again, guess I have another parts order in the near future...

Dion

Posted : 27/11/2020 10:13 pm
towlerg
(@towlerg)
Noble Member
RE: E3D v6 thermistor strategy?

"anything over 230 might lead to PTFE degradation." I have a clove V6 lite and regularly print ABS at 255. I've examined the tube several times and see no degradation. I guess I'm just lucky.

Posted : 28/11/2020 11:11 am
cwbullet
(@cwbullet)
Illustrious Member
RE: E3D v6 thermistor strategy?

@towlerg

I only quote others on the forum.  They reposted this as a reason not to buy an FYSETC hotend for the mini,  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 28/11/2020 2:01 pm
JoanTabb
(@joantabb)
Moderator
RE: E3D v6 thermistor strategy?

@towlerg

do you have the Mini, or the Mk3? 

the Mk3 uses the E3Dv6 with the all metal hotend, in this case the PTFE Stops inside the extruder heatsink, at the top of the heatbreak, and that area should never get hot...   

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 28/11/2020 2:43 pm
towlerg
(@towlerg)
Noble Member
RE: E3D v6 thermistor strategy?

@joantabb

I have a Sovol SV-01. I understand that most of the parts are actually creality. The PTFE tube goes right to the bottom of the heatbreak.

Posted : 28/11/2020 3:40 pm
cwbullet
(@cwbullet)
Illustrious Member
RE: E3D v6 thermistor strategy?

@towlerg

Not all them do.  My CR-10S Pro and ender have PTFE all the way to the nozzle.  That is why I replacted their hotends. 

--------------------
Chuck H
3D Printer Review Blog...
Posted : 28/11/2020 6:09 pm
bobstro
(@bobstro)
Illustrious Member
RE: E3D v6 thermistor strategy?
Posted by: @towlerg

"anything over 230 might lead to PTFE degradation." I have a clove V6 lite and regularly print ABS at 255. I've examined the tube several times and see no degradation. I guess I'm just lucky.

There are two issues with PTFE at high temperatures: PTFE degradation (usually at very high temps) and off-gassing of neurotoxins (somewhere between 240 and 260C and up, depending on the specifics of the tubing). The effects are unlikely to be noticeably dangerous to humans but extremely toxic to some animals and particularly birds. If you're comfortable with "only a little bit of toxicity", this may not be a big deal, but others in your household may feel differently. My main motivator for an all-metal hotend is being able to hot-tighten the nozzle at 285C to get a good seal. 

 

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 28/11/2020 7:22 pm
cwbullet
(@cwbullet)
Illustrious Member
RE: E3D v6 thermistor strategy?

@bobstro

Thanks for the clarification.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 28/11/2020 7:24 pm
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