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How to replace pfte on MK2S?  

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guillaume.d2
(@guillaume-d2)
Active Member
How to replace pfte on MK2S?
I am looking for how to disassemble the hothend on my MK2S in order to replace the pfte tube.
it looks like i need to disassemble the motor but i can't access the 2 bottom screws
The method described here is not applicable to the MK2S. I did not find anything on the forum either. 
Help!
This topic was modified 1 year ago by guillaume.d2
Posted : 27/03/2021 6:45 pm
guillaume.d2
(@guillaume-d2)
Active Member
Topic starter answered:
RE: How to replace pfte on MK2S?

Any idea on how to proceed to reach the 2 screws at the bottom of the motor without dismantling everything?

Someone must have faced the problem, right? 😕 

Posted : 07/04/2021 3:55 pm
Allison Rodgers
(@allison-rodgers)
New Member
RE: How to replace pfte on MK2S?

Hi! 

I'm having a similar issue. I was following this guide: https://help.prusa3d.com/en/guide/how-to-replace-a-ptfe-tube-mk3-mk2-5_17360 (despite the label, this *looks* like my extruder more than the other option.

(The other option: I followed https://help.prusa3d.com/en/guide/how-to-replace-a-ptfe-tube-mk3s-mk2-5s-mmu2s_21664 with a newer machine, and it worked great. The black collet was relatively easy to push in (step 7) and very easy to replace.)

However, I've got everything disassembled and the PTFE tube will not come out with my MK2. I have filament stuck in the PFTE tube and the collet seemed stuck, so I've been poking at it. At this point, I've pretty much destroyed the collet and still cannot get the PTFE out, so I'm pretty frustrated!

I hope the guides are useful to you; in general I find them easy to follow!

Posted : 16/06/2021 12:34 pm
JoanTabb
(@joantabb)
Moderator
RE: How to replace pfte on MK2S?

Hi Alison, 
If the PTFE Won't cone out of thetop of the hotend, try unscrewing the heatbreak from the heatsink, and pushing the PTFE into the heatsink, it should then pop out of the bottom of the heatsink.  regards Joan

If you are still having problems, try heating the heatsink up in the oven to soften the plastic inside, then holt the heatsink with a kitchen glove and push the soft plastic, out, with a 1.5mm allen key/hex wrench and then try pushing the PTFE into the heatsink from the top again

 

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 : 16/06/2021 12:56 pm
karl-herbert
(@karl-herbert)
Illustrious Member
RE: How to replace pfte on MK2S?
Posted by: @guillaume-d2
I am looking for how to disassemble the hothend on my MK2S in order to replace the pfte tube.
it looks like i need to disassemble the motor but i can't access the 2 bottom screws
The method described here is not applicable to the MK2S. I did not find anything on the forum either. 
Help!

Maybe you can get further with this manual (MK2): https://prusa3d.dozuki.com/Guide/2A.+MK2+Extruder+disassembly/372

https://prusa3d.dozuki.com/Search?query=mk2s

good luck!

wbr,

Karl

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 : 16/06/2021 7:18 pm
Allison Rodgers
(@allison-rodgers)
New Member
RE: How to replace pfte on MK2S?

@joantabb

Thank you! I really appreciate knowing that the heatsink unscrewed from the heatbreak! After unscrewing, it was still stuck.

I heated up the heatsink in the oven as you suggested, and was able to remove the stuck PLA, PTFE tube, and collet! Thank you so much.

Now I just need to get a replacement collet, and I can put it all back together again 🙂

Posted : 23/06/2021 7:46 pm
JoanTabb
(@joantabb)
Moderator
RE: How to replace pfte on MK2S?

try https://e3d-online.com/products/embedded-bowden-collet-for-metal-1-75mm?_pos=2&_sid=e011d5da9&_ss=r

if you are in the uk, or one of their resellers, or triangle labs on Ali Express. or Prusa

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 : 23/06/2021 11:34 pm
dyson
(@dyson)
Active Member
RE: How to replace pfte on MK2S?

I'm trying to replace the PTFE on my MK2S as well. As you can see in the attached picture, I've managed to expose the hotend, but I don't know where to go from here. I assume I need to remove the hotend from the orange casing, but I don't know how to do that. Thanks for the help!

Posted : 05/06/2022 4:40 am
Zoltan
(@zoltan)
Moderator
RE: How to replace pfte on MK2S?

Just pull it out carefully be carefull with wiring.

even an old man can learn new things 🙂
Standard I3 mk3s, FW 3.10.1 RC1, MMU2S, no closed box, Fusion 360, PrusaSlicer, Windows 10
PRUSA MINI FW 4.3.4, Prusa Connect Beta

Posted : 05/06/2022 5:25 am
dyson
(@dyson)
Active Member
RE:

Thanks for the reply. The problem is I can't get the hotend to budge (see video here: ). I think the difficulty is due to the PTFE tube extending from the hotend up through the orange plastic piece (you can see it poking out at the top if you squint). 

Step 7 of the tutorial for replacing a PTFE tube in an MK2.5 ( https://help.prusa3d.com/guide/how-to-replace-a-ptfe-tube-mk3-mk2-5_17360 ) says there is a special technique for removing the hotend in that model. I tried it on my MK2S and it did not work...perhaps I'm doing it wrong? 

Thank you for the help!

This post was modified 3 weeks ago by dyson
Posted : 05/06/2022 10:15 pm
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