Dragon Hotend Mod keeps...clogging? I don't know exactly. Stops extruding anyway.
 
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Dragon Hotend Mod keeps...clogging? I don't know exactly. Stops extruding anyway.  

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vanayad
(@vanayad)
Eminent Member
Dragon Hotend Mod keeps...clogging? I don't know exactly. Stops extruding anyway.

Hi everyone,

I have done a mod upgrade to my Prusa MK3S+  and I don't know what the issue is. 
I got this one: https://www.amazon.de/gp/product/B086JQ929H/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
Dragon Hotend High Flow. It printed for around 1h, and then simply couldn't push enough filament through. 

If I start a new print, it won't work, I have to unload and then load the filament again.

This varies though. Sometimes it is after a few minutes, sometimes more.

  • I've played with the tension screw
  • I've added more thermal paste between the heating source and the heat block
  • The PTFE tube fits correctly
  • The Experimental feature for the motors is enabled to lower the temps a bit (the motor is a very hot)
  • I've even increased the volumetric flow from 15mm3 to 20mm3

I am stumped, this is a 100euro 'drop in replacement' yet... I simply can't get it to work. Any advice is welcome!

 

Posted : 27/07/2021 12:39 pm
cwbullet
(@cwbullet)
Illustrious Member
Cold pull

Have you done a cold pull?

--------------------
Chuck H
3D Printer Review Blog...
Posted : 27/07/2021 12:43 pm
vanayad
(@vanayad)
Eminent Member
Topic starter answered:
.

Several. It comes out clean.

Posted : 27/07/2021 12:46 pm
cwbullet
(@cwbullet)
Illustrious Member
Photo

Can you post a photo of the cold pull?

--------------------
Chuck H
3D Printer Review Blog...
Posted : 27/07/2021 12:49 pm
vanayad
(@vanayad)
Eminent Member
Topic starter answered:
Photo

Do note that it was really hard to get the filament flowing. Heated the nozzle to 275, and I had to leave it there a bit to be able to push through, otherwise it wouldn't budge. After it started flowing, cooled it off just like in the manual/website and this came out, seems clean.

 

 

Posted : 27/07/2021 1:01 pm
vanayad
(@vanayad)
Eminent Member
Topic starter answered:
Nozzle

I was wondering if the issue could be the nozzle? I'm using the one that came with the Phaetus, and I think it is not a normal brass model, right? 

Should I change the temps I'm using? Increase them a bit? 

Posted by: @cwbullet

Can you post a photo of the cold pull?

 

Posted : 27/07/2021 2:12 pm
vanayad
(@vanayad)
Eminent Member
Topic starter answered:
Nozzle Changed

I changed the nozzle and printed another benchy. Same result though, roughly after the same amount of time.

Posted : 27/07/2021 4:02 pm
cwbullet
(@cwbullet)
Illustrious Member
Issue

Have your tried printing a temperature tower.  I think this is either a filament issue or a temperature issue. 

--------------------
Chuck H
3D Printer Review Blog...
Posted : 27/07/2021 6:05 pm
vanayad
(@vanayad)
Eminent Member
Topic starter answered:
Issue

I have not, but I will. I doubt it is a filament issue, I'm using prusament that works perfectly usually.

Posted by: @cwbullet

Have your tried printing a temperature tower.  I think this is either a filament issue or a temperature issue. 

 

Posted : 27/07/2021 7:57 pm
vanayad
(@vanayad)
Eminent Member
Topic starter answered:
Nozzle diameter

Could it be that it is a high flow hot end and I'm using a 0.4mm nozzle?

Posted : 27/07/2021 8:00 pm
vanayad
(@vanayad)
Eminent Member
Topic starter answered:
Temperature Tower

I cannot print it, the 0.4 nozzle gets clogged before finishing the first 225C part.

Posted by: @cwbullet

Have your tried printing a temperature tower.  I think this is either a filament issue or a temperature issue. 

 

Posted : 27/07/2021 8:48 pm
fuchsr
(@fuchsr)
Noble Member

You sure you're printing PLA? I've seen stuff like this when I accidentally put a spool of PETG in instead of PLA. 

Posted : 27/07/2021 9:41 pm
vanayad
(@vanayad)
Eminent Member
Topic starter answered:
pla

I'm printing this: https://shop.prusa3d.com/en/prusament/800-prusament-pla-vanilla-white-1kg.html

Posted by: @fuchsr

You sure you're printing PLA? I've seen stuff like this when I accidentally put a spool of PETG in instead of PLA. 

 

Posted : 28/07/2021 12:13 am
fuchsr
(@fuchsr)
Noble Member
mmh

Reminds me that when I started to investigate the Dragon, I saw a boatload of reports of clogging with the high flow version, so I decided to go with the standard flow version instead, which has served me well.

Do you print inside an enclosure? I remember that as one of the scenarios that people reported make the high flow clog.

Posted : 28/07/2021 12:35 am
vanayad
(@vanayad)
Eminent Member
Topic starter answered:
enclosure

Nope, it is open... 🙁 

Posted by: @fuchsr

Reminds me that when I started to investigate the Dragon, I saw a boatload of reports of clogging with the high flow version, so I decided to go with the standard flow version instead, which has served me well.

Do you print inside an enclosure? I remember that as one of the scenarios that people reported make the high flow clog.

 

Posted : 28/07/2021 12:53 am
cwbullet
(@cwbullet)
Illustrious Member
Clog

 

Posted by: @vanayad

Nope, it is open... 🙁 

Posted by: @fuchsr

Reminds me that when I started to investigate the Dragon, I saw a boatload of reports of clogging with the high flow version, so I decided to go with the standard flow version instead, which has served me well.

Do you print inside an enclosure? I remember that as one of the scenarios that people reported make the high flow clog.

 

I am not having issues with clogging but I do not print that filament.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 28/07/2021 1:22 am
vanayad
(@vanayad)
Eminent Member
Topic starter answered:
high flow?

so you're printing with a dragon high flow with a 0.4 nozzle? What temps are you using? What nozzle?

Posted by: @cwbullet

 

Posted by: @vanayad

Nope, it is open... 🙁 

Posted by: @fuchsr

Reminds me that when I started to investigate the Dragon, I saw a boatload of reports of clogging with the high flow version, so I decided to go with the standard flow version instead, which has served me well.

Do you print inside an enclosure? I remember that as one of the scenarios that people reported make the high flow clog.

 

I am not having issues with clogging but I do not print that filament.  

 

Posted : 28/07/2021 6:54 am
vanayad
(@vanayad)
Eminent Member
Topic starter answered:
bump

Anyone got any ideas on how to fix the clogging? 🙁 I've tried upping the printing speeds, but to no avail. 

Posted : 29/07/2021 6:35 am
cwbullet
(@cwbullet)
Illustrious Member
clogs

 

Posted by: @vanayad

Anyone got any ideas on how to fix the clogging? 🙁 I've tried upping the printing speeds, but to no avail. 

Upping your print speed in a clog is only going to increase clicking.  Imagine increasing the flow in a hose when you have it compressed, it is not going to increase flow.  Have you tired to clear the clog?  I do cold pulls, use acupuncture needles, and will use 1.5mm welding rods.  It all depends on where the clog is.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 29/07/2021 9:33 am
vanayad
(@vanayad)
Eminent Member
Topic starter answered:
clogs

I remove the clog, extrude some material to make sure it is unclogged, then print with the increased speeds. 

Posted by: @cwbullet

 

Posted by: @vanayad

Anyone got any ideas on how to fix the clogging? 🙁 I've tried upping the printing speeds, but to no avail. 

Upping your print speed in a clog is only going to increase clicking.  Imagine increasing the flow in a hose when you have it compressed, it is not going to increase flow.  Have you tired to clear the clog?  I do cold pulls, use acupuncture needles, and will use 1.5mm welding rods.  It all depends on where the clog is.  

 

Posted : 29/07/2021 10:01 am
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