Replacement of the HotEnd Heater Cartridge for the MK3S
 
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Replacement of the HotEnd Heater Cartridge for the MK3S  

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labosky_j
(@labosky_j)
New Member
Replacement of the HotEnd Heater Cartridge for the MK3S

Anyone have any tips on replacing the Hot End Heater Cartridge? I snagged one of it's wires and it broke off, so I ordered a replacement.  It looks like that Cartridge is simply pressed into the heat sink (no threads), but I expect extracting it may be difficult since I've used the printer quite allot. I'm guessing it will be stuck after numerous heating cycles.  I'd prefer extracting it without removing the entire HotEnd Assembly. Any help is surely appreciated.

Posted : 16/08/2021 12:42 pm
Neophyl
(@neophyl)
Famed Member

Check the online assembly manual  for pictures if you arent familiar with how its fitted.  Its has a small grub screw located near the nozzle that keeps it in place.  That needs loosening and then the heater cartridge can be removed.  Of course how much crud plastic you have will determine how easy that is to do.  That's another reason to always fit a silicone sock over the heater as it stops such build up.

The biggest pain is removing the wiring from the cable loom.  and putting it all back again afterwards.  That will require quite a bit of disassembly.  Its why I ran a replacement cable that ended in the same connector the last time I had it apart.  I can now swap heaters without doing anything more that undoing the grub screw.  It pays to plan ahead 🙂  I did the same for the thermistor and fan wires too.

Posted : 16/08/2021 1:08 pm
fuchsr
(@fuchsr)
Noble Member

Heat the hotend to 285 degrees. Makes it much easier to remove the heater cartridge. Just remember it's HOT now. 

Posted : 16/08/2021 1:50 pm
bobstro
(@bobstro)
Illustrious Member
What connectors?
Posted by: @neophyl

[...] Its why I ran a replacement cable that ended in the same connector the last time I had it apart.  I can now swap heaters without doing anything more that undoing the grub screw.  It pays to plan ahead 🙂  I did the same for the thermistor and fan wires too.

What connectors did you wind up using?

 

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 : 16/08/2021 1:52 pm
labosky_j
(@labosky_j)
New Member
Topic starter answered:
Replacement of the HotEnd Heater Cartridge for the MK3S

Wow... thanks for the quick reply. I bought my MK3S as a kit, so I am familiar with the parts, however, the heater/extruder came as an assembly, so I didn't need to pay attention to how the heater was held. It looks like I can do that replacement without removing the head. Removing the wiring and plugging in the new wires aren't too bad. Thanks again, John

Posted : 16/08/2021 2:27 pm
labosky_j
(@labosky_j)
New Member
Topic starter answered:
Replacement of the HotEnd Heater Cartridge for the MK3S

Great suggestion... I guess I'll heat it if I run into problems. Also, I suppose I'd need to use a heat gun with a pencil tip since the heater wire is broken and I cant use it to self heat the heat sink.

Posted : 16/08/2021 2:29 pm
Xanthe
(@xanthe)
Trusted Member
RE: Connectors

I plan to do the same using:

2 way JST XH2.5 for the heater (connector rated 3A, heater current 40W/24V =1.67A). Given the temperature environment, this is the lowest margin I would consider using.
2 way JST PH2.0 for the thermistor (v low current).
I may add a 3 way JST PH2.0 for the fan, I've not decided on this as yet.

Posted : 16/08/2021 2:47 pm
Neophyl
(@neophyl)
Famed Member

 

Posted by: @bobstro
Posted by: @neophyl

[...] Its why I ran a replacement cable that ended in the same connector the last time I had it apart.  I can now swap heaters without doing anything more that undoing the grub screw.  It pays to plan ahead 🙂  I did the same for the thermistor and fan wires too.

What connectors did you wind up using?

 

I bought a replacement heater cartridge direct from e3d, it comes with the cartridge with their standard connector, it also comes with an extension cable that ends in 2 crimped ferrules.  They will screw into the connector used on the einsy with no problems replacing the Prusa ones. As it’s supplied by e3d you know both the connector and wire specified to handle the current and any heat. That gives you the perfect setup a the connector sits handily tucked above the fan shroud and you can change the heater at will with any proper e3d one. 

Posted : 16/08/2021 3:39 pm
bobstro liked
bobstro
(@bobstro)
Illustrious Member
That's certainly simple!
Posted by: @neophyl

 I bought a replacement heater cartridge direct from e3d, it comes with the cartridge with their standard connector, it also comes with an extension cable that ends in 2 crimped ferrules.  They will screw into the connector used on the einsy with no problems replacing the Prusa ones. 

Well, that certainly makes life easier. I did not realize they provided that extension cable! Is one also provided with their thermistor?

 

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 : 16/08/2021 3:54 pm
Neophyl
(@neophyl)
Famed Member

Sorry Bob but it’s been so long I can’t recall about the thermistor. 

Posted : 17/08/2021 5:06 am
bobstro
(@bobstro)
Illustrious Member
Same connector for thermistor & heater cartridge?
Posted by: @neophyl

Sorry Bob but it’s been so long I can’t recall about the thermistor. 

If they're both the same connector, I suppose ordering 2 heater cartridges would work. Thanks for the tip!

 

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 : 17/08/2021 7:08 am
cwbullet
(@cwbullet)
Illustrious Member
Heat gun

A heat gun should work to heat the hotend enough to loosen the screws and thermistor.  I never use the wire to remove the cartridge.  Instead, I hold the hotend with pliers and push the cartridge out with a screw driver.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 17/08/2021 10:49 am
labosky_j
(@labosky_j)
New Member
Topic starter answered:
reply from Labosky...

Good advice, thanks. I got lucky because it wasn't stuck... after I loosened the retainer screw and tugged a bit on the heater, it rotated free and I pushed it out with a screw driver just like you mentioned... not I'm waiting on my order from Prusa.

Posted : 17/08/2021 1:06 pm
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