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Total Devastation  

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David R. Campbell
(@david-r-campbell)
Eminent Member
Total Devastation

I've reprinted this code (4 bookmarks) at least a dozen times with the same filament, and then this happens.

Anybody have a clue?  It it one of those "it happens sometimes, clear the plate and start over" situations?

Posted : 21/07/2025 3:19 am
David R. Campbell
(@david-r-campbell)
Eminent Member
Topic starter answered:
RE: Total Devastation

Overture PETG, 0.4mm Nozzle, 0.1mm Fast Detail layer height.

Posted : 21/07/2025 3:22 am
Diem
 Diem
(@diem)
Illustrious Member

Why are you using 0.1mm layers?

Cheerio,

Posted : 21/07/2025 11:38 am
1 people liked
David R. Campbell
(@david-r-campbell)
Eminent Member
Topic starter answered:
RE: Total Devastation

The entire bookmark is 1.2mm thick.  It has 3 layers of a different color on top.  Larger layer height would be fewer of the 2nd color, and more color dilution/bleed through resulting in less contrast.

Posted : 21/07/2025 12:14 pm
1 people liked
Diem
 Diem
(@diem)
Illustrious Member

Two 0.2mm (easier to print) layers are usually enough to preserve colour and minimise filament changes.  So four layers should be enough.

See: https://forum.prusa3d.com/forum/prusaslicer/looking-for-help-in-a-file-on-the-slicer-anyone-have-the-knowledge-to-assist-me/#post-757940

And for the background detail see:

https://forum.prusa3d.com/forum/prusaslicer/manual-multicolor/

https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-how-do-i-print-this-printing-help/acting-as-my-own-mmu

Cheerio,

Posted : 21/07/2025 1:52 pm
CJD
 CJD
(@cjd)
Trusted Member
RE: Total Devastation

I found I had to tune overture petg to avoid blob buildup on the nozzle. And disasterous tesults at higher speed and low layer height. Flow rate the big change.

Posted : 21/07/2025 2:37 pm
David R. Campbell
(@david-r-campbell)
Eminent Member
Topic starter answered:
RE: Total Devastation

I'll turn down the flow rate to what, 80% of what the filament preset calls for?

Posted by: @cjd

I found I had to tune overture petg to avoid blob buildup on the nozzle. And disasterous tesults at higher speed and low layer height. Flow rate the big change.

 

Posted : 21/07/2025 2:49 pm
Chris Hill
(@chris-hill)
Honorable Member
RE: Total Devastation

If a small blob of filament accumulates onto the nozzle, an adjustment of 2-3% is usually enough - so I tend to set the EM to 0.97 with uncalibrated no-name filament brands, since a couple of percent under-extrusion is usually much better tolerated than a couple of percent over-extrusion.

But I can't help thinking there's something else going on with your print.  The sort of blob you get with a bit of over-extrusion is usually small and occasional.  I suppose a single such blob could have cause one of the layer shifts evident in your print, which would then lead to the nozzle extruding filament into empty space, which could have caused the rest of the devastation.

Posted : 21/07/2025 3:00 pm
David R. Campbell
(@david-r-campbell)
Eminent Member
Topic starter answered:
RE: Total Devastation

This is the first time that's happened in a dozen prints.  I'll tweak it as you suggested, thanks a lot!

Posted by: @chris-hill

If a small blob of filament accumulates onto the nozzle, an adjustment of 2-3% is usually enough - so I tend to set the EM to 0.97 with uncalibrated no-name filament brands, since a couple of percent under-extrusion is usually much better tolerated than a couple of percent over-extrusion.

But I can't help thinking there's something else going on with your print.  The sort of blob you get with a bit of over-extrusion is usually small and occasional.  I suppose a single such blob could have cause one of the layer shifts evident in your print, which would then lead to the nozzle extruding filament into empty space, which could have caused the rest of the devastation.

 

Posted : 21/07/2025 3:39 pm
CJD
 CJD
(@cjd)
Trusted Member
RE: Total Devastation

I think I ended at .96 but if really recommend you tune for your setup (speed, nozzle, etc), and make sure the filament is dry. I was getting lots of blobs which would stick to the print and then just went sideways after. Nothing quite this bad as I caught it early. I agree this looks like more than just blob related, but I'm still early on the learning curve for FDM so I can't say that with confidence. 

Posted : 21/07/2025 6:40 pm
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