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Review: Dragon Hotend  

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HackMonkey
(@hackmonkey-2)
Trusted Member
Filament

I have found some filament likes the automated loading/unloading on the MMU better than others. I have one spool that has to cut every time it loads.

Posted : 26/07/2021 3:42 am
cwbullet
(@cwbullet)
Illustrious Member
Topic starter answered:
Dragonfly

 

Posted by: @marek-4

New Sunon fans should come next weekend. It is quite warm in our country this year and I have 28 degrees Celsius in my room. I will try another type of hotend cooling to rule out a cooling error.

The new Zodiac Dragonfly Hotend should also arrive this week, I also want to do a few tests.

I already have my head full of pain with Dragon and MMU, when I see that I finished 80 hours of printing this weekend in four colors The original Prusa E3DV6 I don't feel like disassembling it again

I still thought maybe I use the wrong brand of filament, I use the cheap brand Gembird due to the price due to MMU. 

Disassembly and reassembly are a constant struggle.  I have not heard of the Zodiac Brand.  

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Chuck H
3D Printer Review Blog...
Posted : 26/07/2021 10:42 am
Marek
(@marek-4)
Eminent Member
RE: Dragonfly

Over the weekend I want to try this modification, I already have all the components at home, which is probably the last option, then I will sell Dragon.

https://www.thingiverse.com/thing:4628399

Zodiac DragonFly manufactured by Phaetus. The Zodiac company comes from Austria, if I'm not mistaken.

This post was modified 3 months ago by Marek
Posted : 26/07/2021 11:20 am
cwbullet
(@cwbullet)
Illustrious Member
Topic starter answered:
zodiac

 

Posted by: @marek-4

Over the weekend I want to try this modification, I already have all the components at home, which is probably the last option, then I will sell Dragon.

https://www.thingiverse.com/thing:4628399

Zodiac DragonFly manufactured by Phaetus. The Zodiac company comes from Austria, if I'm not mistaken.

You are probably correct.  I like the radial fan mount.  Nice find.  

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Chuck H
3D Printer Review Blog...
Posted : 27/07/2021 2:09 am
fuchsr
(@fuchsr)
Noble Member
Dragon Mk3S mount

Just to share my find on this main Dragon related thread:

After a not so great experience with the Dragon on a Mk3S but then a very positive experience on a Mini I couldn't resist and installed another Dragon on the Mk3S. While checking all the mount options I came across this fairly new one: 

https://www.prusaprinters.org/prints/67418-phaetus-dragon-hotend-st-adapter

Other designs to keep the Dragon heat sink from rotating require you to print revised parts of the extruder or a new adapter that needs to be screwed to the hotend. This one is just one tiny piece that slips onto one of the screws on the internal backside of the extruder.  Clean. Simple. Genius. 

Plus, so far the Dragon is doing a lot better than on my first attempt. 

Posted : 10/08/2021 12:25 pm
Xanthe and Livius liked
cwbullet
(@cwbullet)
Illustrious Member
Topic starter answered:
Drsgon

Similar experience and I have two more dragons to try.  

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Chuck H
3D Printer Review Blog...
Posted : 10/08/2021 1:42 pm
Livius liked
Xanthe
(@xanthe)
Trusted Member
PTFE tube for Dragon On a Mk3S

... should be 29.8 +/- 0.2mm long.

As determined by actually measuring the V6 and Dragon hotends!

Posted : 14/08/2021 7:41 pm
fuchsr
(@fuchsr)
Noble Member

Huh, I just installed one a couple of weeks ago on an Mk3S with the + extruder upgrade, and it measured exactly 27 mm for me to stick out as much as the original PTFE And it's been working flawlessly. Not sure where the difference is coming from. 

Posted : 14/08/2021 8:04 pm
cwbullet
(@cwbullet)
Illustrious Member
Topic starter answered:
concur

 

Posted by: @fuchsr

Huh, I just installed one a couple of weeks ago on an Mk3S with the + extruder upgrade, and it measured exactly 27 mm for me to stick out as much as the original PTFE And it's been working flawlessly. Not sure where the difference is coming from. 

I am pretty close on my Mk3S+.  

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Chuck H
3D Printer Review Blog...
Posted : 14/08/2021 8:34 pm
Livius
(@livius)
Eminent Member
MK3S+ w/Phaetus Dragon hotend section

@fuchsr

Here's a section thru my Phaetus and MK3S+ extruder body.  Your PTFE tube may not be fully seated into the counterbore of the heat sink (red arrow).  I know that when I installed my tube, I could feel that step and had to give it a good press to get it seated.  Maybe even put  a slight chamfer on the outside of the tube.  The dimensions shown are from the dragon to the extruder body so the tube should be slightly shorter.  This is also shown in the nominal position and as you can see there can be a slight shift up/down of the dragon.

Posted : 14/08/2021 8:50 pm
fuchsr
(@fuchsr)
Noble Member

@livius

Thank you for sharing the image. So my 27 mm looks close enough for my taste (and it's working fine). Definitely not 29.8. I used a piece of PTFE that is chamfered at the end but I don't think it's necessary (I'm using a flat PTFE tube on the Mini with a Dragon hotend).

Posted : 14/08/2021 8:56 pm
Livius liked
Livius
(@livius)
Eminent Member
PTFE tube gap

Understood.  I only point it out because if the tube isn't fully seated, there may be an auto load issue where the filament tip can catch the gap on its way in as directed by an MMU.

Posted : 14/08/2021 9:36 pm
cwbullet
(@cwbullet)
Illustrious Member
Topic starter answered:
Concur

 

Posted by: @livius

Understood.  I only point it out because if the tube isn't fully seated, there may be an auto load issue where the filament tip can catch the gap on its way in as directed by an MMU.

Very true!  

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Chuck H
3D Printer Review Blog...
Posted : 14/08/2021 9:54 pm
cpu
 cpu
(@cpu)
Eminent Member
Dragon + BMG

Don't remember exact length on mine but I've reused stock PTFE and did 2 adjustments as it's not really hard to see if top sits properly - just a good flashlight and job's done.

Also had few squeaks with Bondtech Extruder but it's all gone - Bondtech support advised 550 mA current. So far few nozzle changes and it's solid, only downside is it's still rotating with Bondtech as there's no place to block spinning.

Did anyone try matchless nozzles on this one? Next nozzle swap will be either Nozzle X or Matchless - I'm tempted to see how much PETG I can push through

Posted : 14/08/2021 10:11 pm
Xanthe
(@xanthe)
Trusted Member
Measurements

Measurements taken with the depth probe of a digital caliper (and rounded to 0.1mm), measuring from the top of the mounting flange to the bottom of the recess for the PTFE Tube:

E3D V6: 32.6
Dragon 18.0

Original PTFE tube height above flange:
Measured: 11.8
Calculated from above & original PTFE Tube Length of 44.3: 11.7

Tube length for Dragon: 18+11.7 = 29.7

Posted : 15/08/2021 11:37 am
Xanthe
(@xanthe)
Trusted Member
External Chamfer

As @livius suggested I did put a small (~0.3mm) chamfer on the outside of the PTFE tube, both to pass any slight misalignment in the assembly, but also because, in practice, it's difficult to machine a right angle recess without leaving a small fillet or chamfer in the bottom corner. (This can be done, but that usually requires either special tooling or a second machining operation to remove it, and neither of those options make economic sense.)

Posted : 15/08/2021 11:59 am
comtechy
(@comtechy)
New Member
dragon

I installed the dragon in my mk3s  petg was great but if I try any pla it clogs am i missing something do i need to change anything in the slicer or buy a better fan

 

please help its driving me nuts

 

tia

Posted : 12/09/2021 9:51 am
Livius
(@livius)
Eminent Member
@comtechy

Tia,

I've only had my dragon clog with PLA once.  My printer is in an enclosure and the ambient got too warm.  I vent my enclosure now when printing PLA.   The heatbreak is a little narrower on the dragon at Ø1.9mm where the V6 hotend is Ø2.0mm.  It would also help to have a tight toleranced filament.  Hope that helps.

Livius

Posted : 12/09/2021 11:57 am
comtechy liked
cwbullet
(@cwbullet)
Illustrious Member
Topic starter answered:
PLA

PLA in a closed enclosure can be very problematic for heat creep.  

Posted by: @livius

Tia,

I've only had my dragon clog with PLA once.  My printer is in an enclosure and the ambient got too warm.  I vent my enclosure now when printing PLA.   The heatbreak is a little narrower on the dragon at Ø1.9mm where the V6 hotend is Ø2.0mm.  It would also help to have a tight toleranced filament.  Hope that helps.

Livius

 

--------------------
Chuck H
3D Printer Review Blog...
Posted : 13/09/2021 9:42 am
comtechy liked
fuchsr
(@fuchsr)
Noble Member

Even with PETG I keep the door open. 

Posted : 13/09/2021 12:19 pm
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