UMS3 - zits and blobs on the surface

[Xhoax 4]

The viber statues we print have zits/blobs on the surface.

It seems like its the transition from the support to the wall surface.

On the last photo you also see the stringing from the support to the outer wall.

 

Is this an overextrusion problem?

How we can improve this?

 

Printer: UM S3

software CURA 5.6.0

material: VIBERS  Colorfabb

nozzle: 0.6AA

layer height: 0.12

print temp: 200

bed temp: 20

flow: 103

Print speeds + infill: 50

print speeds all wall speeds: 30

 

 

 

 

[Slashee_the_Cow 438]

I think you gotta stick to regular filaments 😄

Looking at the last picture, it's possible that the support is close enough that it's not doing a retraction when it moves from the support to the model. You can try changing Travel > Retraction Minimum Travel to something really low (like 0.1mm) to try and make it retract all of those bits.

[Xhoax 4]

3 hours ago, Slashee_the_Cow said:

I think you gotta stick to regular filaments 😄

Looking at the last picture, it's possible that the support is close enough that it's not doing a retraction when it moves from the support to the model. You can try changing Travel > Retraction Minimum Travel to something really low (like 0.1mm) to try and make it retract all of those bits.

Thanks for reply

Sticking to regular filaments is a no go 😁

This is a hot seller.

 

I was thinking in the same direction, i tried retract at layer change, but no difference.

 

Next time i will try to decrease the distance, i keep you posted

[Xhoax 4]

On 9/13/2024 at 2:51 AM, Slashee_the_Cow said:

I think you gotta stick to regular filaments 😄

Looking at the last picture, it's possible that the support is close enough that it's not doing a retraction when it moves from the support to the model. You can try changing Travel > Retraction Minimum Travel to something really low (like 0.1mm) to try and make it retract all of those bits.

Hi Slashee

 

I finaly die the test (had to print some other filaments first)

 

I reprinted the statue, so incan compare

 

Like you said, i set the 'retraction minimum travel' tot 0.1

It's a lot beter! (Like 70% tone)

 

But there are still zits/blobs on the surface.

 

(Photo's)

Now i printed a smaller one, and it looks like there are some more blobs. You van also see the stringing netwerk support and statue surface.

 

What can i do to improve this?

 

 

[Slashee_the_Cow 438]

Well firstly I'm going to say the thing which is obvious to my weird brain: check the slice to make sure that's not some overextrusion on your Z seams.

Also, I'm not familiar with that filament in the slightest, but could those be some bits of fibre or something sticking out? Almost looks like you could pick them off with your fingernail.

 

As for stringing between support structure and model: How tough is that stuff? At one point as an audience request I wrote a post-processor which forces all G0 travel moves in support, as well as the moves before and after support sections (i.e. from and to the model) to retract. Problem is that can be a lot of retractions in a small amount of filament (and the script ignores Cura's maximum retracts per length of filament setting) depending on how complex your support structure is. You could try that. If you want I can make a version which will only affect the moves at the start and end of support to avoid having a bunch of retractions in the support.

 

Edit: File removed. That script had issues.

 

Edited October 2 by Slashee_the_Cow
Removed file

[Xhoax 4]

5 hours ago, Slashee_the_Cow said:

Well firstly I'm going to say the thing which is obvious to my weird brain: check the slice to make sure that's not some overextrusion on your Z seams.

Also, I'm not familiar with that filament in the slightest, but could those be some bits of fibre or something sticking out? Almost looks like you could pick them off with your fingernail.

 

As for stringing between support structure and model: How tough is that stuff? At one point as an audience request I wrote a post-processor which forces all G0 travel moves in support, as well as the moves before and after support sections (i.e. from and to the model) to retract. Problem is that can be a lot of retractions in a small amount of filament (and the script ignores Cura's maximum retracts per length of filament setting) depending on how complex your support structure is. You could try that. If you want I can make a version which will only affect the moves at the start and end of support to avoid having a bunch of retractions in the support.

ForceSupportRetract.zip 1.23 kB · 1 download

Thanks for the reply,

 

can you tell me how i can install/open the file? I see it's a Phyton file but i don't have any experience with it.

How i can i use it?

 

it's not overextrusion on the Z-seam.

The parts are not pieces of fibre sticking out, they are blobs/zits.

but you could pick them off with your fingernail, but it leaves a little mark.

Which can be fixed with sanding. (we sand all the statues but with the blobs it's a lot more work)

 

 

[Slashee_the_Cow 438]

Here's the instructions, but I'm working on a new version so don't do it on the version I already posted 🙂

1. In Cura go to Help > Show Configuration Folder
2. In the file explorer window that pops up, go into the scripts folder.
3. Drop the Python script into that folder.
4. Restart Cura.
5. In Cura, go to Extensions > Post Processing > Modify G-Code
6. In the box that pops up, click Add a script and choose the one you want.

Edited September 21 by Slashee_the_Cow
had brain fart

[Xhoax 4]

On 9/21/2024 at 2:31 PM, Slashee_the_Cow said:

Here's the instructions, but I'm working on a new version so don't do it on the version I already posted 🙂

1. In Cura go to Help > Show Configuration Folder
2. In the file explorer window that pops up, go into the scripts folder.
3. Drop the Python script into that folder.
4. Restart Cura.
5. In Cura, go to Extensions > Post Processing > Modify G-Code
6. In the box that pops up, click Add a script and choose the one you want.

Hi Slashee, i will wait for the new version.

 Keep me posted please 

[Xhoax 4]

So i tested the program of Slashee, but that didn't fix the problem.

 

Can anyone help me with this problem?

I tried a lot, but im out of ideas.

[Slashee_the_Cow 438]

Tried contacting ColorFabb asking them for advice? It is their weird filament, after all.

[Torgeir 267]

Hi there.

You've got good advice from @Slashee_the_Cow.

 

I've looked into the models people printed with this filament and say "most" of them are print can be done without support.

 

I'd say you have a special flair for these exotic filament types. 🙂 
The previous one was (PLA) filament filled with copper particles and this last (PLA variant) "filled" with elephant grass. These two types "represent" the extremes of the "exotic" filament types.
In addition, the chosen color is white, which has lower self-radiation than the darker colors. So the brighter filaments really need better temperature control and "often" a good cooling management as well!
Let's look at how the nozzle block react changing temperature in general..
When the speed changes, the temperature must react accordingly.
This does not happen quickly, so the slowness of heat change in the nozzle head plus the fact that the color is white will further delay temperature change.
All this will be "displayed" on the object you are trying to print..

 

You can "avoid" most of this by keeping all speeds the same, try a test with speed 25 mm/s.
This will reduce the "fluttering" nozzle leaking..
The nozzle temperature might also be reduced a "little".

 

Just my 5p.

Thanks

Torgeir

 

 

 

[Slashee_the_Cow 438]

17 hours ago, Xhoax said:

So i tested the program of Slashee, but that didn't fix the problem.

If anyone's wondering what that means, I wrote a post-processor that forces a retraction on every move between support and model, whether or not it's above Travel > Minimum Retraction Travel. It's attached if you think that's your sort of thing.

 

@Xhoax: you said at the start you were using a AA print core. I'm far from an UltiMaker expert (unfortunately the role of "Assistant Moderator" doesn't come with a free S5... I asked) but aren't the CC (thanks @Torgeir) cores meant for coarser materials like this would be? Looks like the AA is just for stuff which is smooth.

SupportEntryExitRetractV2.zip

Edited October 2 by Slashee_the_Cow
changed core type

[Torgeir 267]

Hi @Slashee_the_Cow.

 

The BB Core are special designed for use of PVA.

However I'll think the slot 2 (R/H), may take any AA core according to the setting for this position, but primary used for support material.

 

The CC Core 0.6mm are used for composite filament.

 

Here's a link for the use of UM cores:

 

https://support.ultimaker.com/s/article/000002903

 

Torgeir

[Slashee_the_Cow 438]

@Torgeir thanks for that! It does sound like a CC core might be worth a try if you have one. By the looks of it the AA cores are designed for plain old filaments with nothing stuck in them.

[Torgeir 267]

Hi @Slashee_the_Cow,

 

Do not have a CC core, -but @Xhoax have the CC core as it is the only one with 0.6mm size.

 

[Xhoax 4]

On 10/2/2024 at 5:04 PM, Torgeir said:

Hi @Slashee_the_Cow,

 

Do not have a CC core, -but @Xhoax have the CC core as it is the only one with 0.6mm size.

 

hi thats true, i have the 0.6 core and its CC