Nozzle change and now I have issues!  

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steveni
(@steveni)
Active Member

Newbie here. I was experimenting with a 0.6mm nozzle and I did a nozzle change. I decided that I wanted to go back to the 0.4mm. Before the change, everything was working fine. But now I find that I can't get through a print without some issues, I have done z-test, some test squares and I think I have the z-index correct. But I'm finding it is catching sometimes, and the filament tends to web when picking up and getting caught which it never did before. I didn't change anything else.

Could I have put the nozzle in wrong? Could something have gotten caught up there? After first nozzle change some filament came out of the space between nozzle and heat bed. So I took out the nozzle and put in a clean one. Do I need to open it right up and clean the thing out? I followed the video to a T. 

I have also noticed a slight burning smell sometimes. Nothing is leaking, maybe I'm just being overly cautious. 

 

 

Posted : 04/05/2021 10:37 pm
Diem
 Diem
(@diem)
Honorable Member

I think I have the z-index correct.

You have recalibrated after changing the nozzle?

Do so even if reinstalling one from before; a quarter turn more or less when fitting is enough to ruin a print.

It's always worth making sure the bed is clean, a common cause of failure.

After first nozzle change some filament came out of the space between nozzle and heat bed.

This is a genuine E3D nozzle?  There are cheap nozzles available with the wrong length thread...

I have also noticed a slight burning smell sometimes.

PLA sometimes smells of popcorn.

Cheerio,

 

Posted : 05/05/2021 12:09 am
Tim
 Tim
(@tim-2)
Illustrious Member

First and foremost: did you follow the E3D-V6 nozzle replacement guide - to the letter?  If you didn't read and follow that guide. Do it now. Then come back and ask again if the subsequent reassembly has issues.

https://e3d-online.dozuki.com/Guide/Changing+Nozzles/45

https://wiki.e3d-online.com/E3D-v6_Assembly

And bring photos of the reassemble - especially the nozzle placement in the heater block.

 

This post was modified 1 week ago 2 times by Tim
It is always wise to get more than one opinion...
Posted : 05/05/2021 12:29 am
steveni
(@steveni)
Active Member

@diem

I have done the recalibrating. The bed is always clean, IPA. I bought the nozzle directly from Prusa. 

Posted : 05/05/2021 12:42 am
fuchsr
(@fuchsr)
Honorable Member

As @diem said, even something as simple as a nozzle change can throw off the Live Z and may require recalibration. 

Filament oozing like you described is a tell-tale sign for a wrong hotend assembly. 

The nozzle needs to be tightened against the heatbreak, not the heater block.

If correctly assembled there's a gap between the nozzle and the bottom of the heater block.

In addition to the E3D assembly instructions provided by @tim-2, there are also Prusa specific instructions in their knowledgebase:

Mk3S
Mini

This post was modified 1 week ago 2 times by fuchsr
Posted : 05/05/2021 12:47 am
steveni
(@steveni)
Active Member

@tim-2

Yes, I followed the Prusa change guide exactly. I don't mess around.

My heat block was clean but I just tried the Benchy and is went perfectly until about halfway and then something happened and it went wild. ARG.

This post was modified 1 week ago 2 times by steveni
Posted : 05/05/2021 12:53 am
steveni
(@steveni)
Active Member

@fuchsr

The filament came out of the bottom between the nozzle and the heat bed. I don't know how. Unless it oozed down while I was changing it.

I have successfully been able to print since without any oozing thankfully. I say successful, but it failed due to other reasons.

Posted : 05/05/2021 1:02 am
Tim
 Tim
(@tim-2)
Illustrious Member

Prusa's guide is not nearly as good as E3D's guide; and in my experience will cause you problems unless you ignore parts of it. e.g., your nozzle looks like it is too far into the heater block.

Regarding the Benchy - that's a clear clean adhesion problem.

This post was modified 1 week ago 3 times by Tim
It is always wise to get more than one opinion...
Posted : 05/05/2021 3:07 am
steveni
(@steveni)
Active Member

@tim-2

Thanks, I was sure I had it out enough. I'll adjust a bit. 

I was able to finish a benchy to completion tonight with no issues. 

Posted : 05/05/2021 5:15 am
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