Fuzzy / Hairy prints with DX 0.6mm nozzle

Hello folks,

Looking for a bit of guidance with something.

it’s something screwy with the Slice as the supports themselves are clean.

The print quality on the 0.6 nozzle is horrid,
Aside from Luban not offering any profile configurations similiar to the 0.4mm nozzle which makes it hard to compare.
I have not run it through another slicer e.g cura / prusa.

Have been wracking my brain trying to work it out.

Filament: e-Sun PLA
Nozzle: 200c
Bed: 60deg
Resolution: 0.18mm layers
Speed: 40mm/s.
Config: Stock Luban 0.6 profile from what I can tell.
Genuine 0.6mm hot end module.

Esteps seem fine

echo: M92 X160.00 Y160.00 Z400.00 B888.89 Current E667.22, BACKUP SINGLE E212.21, BACKUP DUAL E667.22

Measurement comes in near bang on unless I start pulling out a micrometer to get it down to the absoloute.

Filament is dry well dry and had been sitting in the dryer for about 10hrs before~

Can anyone spot what i’ve stuffed up?

I did attempt to drop down to 195, but didn’t want to bring it down further unless I start clogging up.

When completed its pretty much fuzzy all over and it does come off with a bit of effort,

STL Link -

I cannot upload the gcode here as it’s over 8mb.
so here is a G drive link if you wanted to look over it -

What it looks like:

What it’s supposed to look like:

Attached is the JSON file of the current 0.6mm config
Normal Print (0.6).def.json (29.1 KB)

PLS Config, to view change it from JSON to DEF
PLA-ESUN.json (5.6 KB)

Hopefully there is enough info here for some people smarter than me to take a single look and go “aha! it’s that!”


I’ve never used a larger than standard nozzle, but here are a few thoughts:

  • When I used a smaller nozzle, I needed to change the temperature to get consistent prints - I guess heating/cooling behaviour changes with nozzle/extrusion properties.
  • Are you sure you instructed the slicer to calculate flow for the 0.6 nozzle? The look of your print might hint on underextrusion, but admittedly this is a bit inconclusive… Still, perhaps try a different slicer and make sure it is set to 0.6 mm nozzle. Or, alternatively, increase flow rate - Math says: Area of 0.4 mm nozzle = pi * 0.2² = 0.126 mm² - Area of 0.6 mm nozzle = pi * 0.3² = 0.283 mm² → Flow needs to be set to 225%. If the slicer uses 0.4 mm nozzle profile, you’ll end up with severe underextrusion obviously.

When I tried a 1.0mm nozzle (successfully - eventually) I found I had to raise the nozzle temp as the centre of the filament wasn’t heating up quickly enough as it was passing through the nozzle which caused the material to come out blobby.
The regular pattern of your blobs though makes me think of the extruder gear. I would check that too.
Also, wouldn’t you say 0.18mm layer height is a bit small for a 0.6mm nozzle?

I would tune your system via Teachingtech’s steps with your 0.6 nozzle before printing anything serious.

1 Like

Heya, Thanks for the reply.
It’s through Luban and using the OEM 0.6mm nozzle modules that go into the dual extruder unit.

So I would be expecting it to compensate accordingly.

file_total_lines: 897190
;estimated_time(s): 66267.24
;nozzle_temperature(°C): 200
;nozzle_0_diameter(mm): 0.6
;Extruder 0 Retraction Distance:1
;Extruder 0 Switch Retraction Distance:16
;nozzle_1_temperature(°C): 200
;nozzle_1_diameter(mm): 0.4
;Extruder 1 Retraction Distance:1
;Extruder 1 Switch Retraction Distance:16
;build_plate_temperature(°C): 60
;work_speed(mm/minute): 2400
;max_x(mm): 214.78350067138672
;max_y(mm): 263.3475036621094
;max_z(mm): 119.60299682617188
;min_x(mm): 105.21649932861328
;min_y(mm): 86.65249633789062
;min_z(mm): 0
;layer_number: 664
;layer_height: 0.18
;matierial_weight: 190.39880358917435
;matierial_length: 63.8376
;nozzle_0_material: PLA-ESUN Silk
;nozzle_1_material: PLA-Gold
;Header End

;Snapmaker Luban 4.10.2
;Mon Feb 12 2024 21:5:48

Is an E-step of E667.22 normal for a dual extruder? Seems high.

This is OK for this setting, my extruder calibration was pretty on point.

1 Like

I would try raising the printing temp to 220, lower the retraction to 0.6 and also lower the printing speed…

Second what you suggest, except for print speed: He’s already at 40 mm/s - I consider this as very slow…

Yes indeed. That is pretty slow. I did not realize he was already @ 40 mm/sec :slightly_smiling_face:

What happens if you observe your print?
I guess the filament force to be pulled is too high so the tool head/nozzle lifts up?

I would even try to print more hot, recently I printed with 0.6mm petg at 240°C instead of 225°C so Hauke hits a good suggestion with 220°C.

I guess it has to do with your infill, try changing that, infill before or after walls.
Also 1 wall more might do the trick? Have had it to but not so severe, added an extra wall and it was fixed.
maybe your infil overlap is to much?

Hi all,

A small update.

Changed out from the current filament dryer unit (Sunlu S4) to the Sunlu S1 which spins more freely thinking this could be the culprit, along with changing back to a 0.4 nozzle.

Using “Precise and Strong” default on Luban on 0.16 on the 0.4mm nozzle, Thin Model structure on another model netted the same thing with the diagonal marks on the outer.

I’ve just reset the config in the entire Luban application, and reset all the pre-defined settings.

I’d run it in Cura, but it doesn’t allow colour painting like Luban does (that i’ve found).

Now that i’ve reset it i’ll run it through again and see what it does.