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Problem with Prusament PETG  

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trilbytim
(@trilbytim)
Active Member
Problem with Prusament PETG

I've been printing big objects with sparse (5%) cubic infill (they're moulds for moulding carbon fibre parts on) with my Prusa XL with enclosure. These have been working very well with standard ColorFabb economy PETG. I recently got some 2kg rolls of Prusament PETG (they were on offer and I was ordering other items from Prusa, so it seemed worth it, and I thought it would work better than the economy stuff). However I'm now getting bad defects on the infill. These start as little gaps, but get steadily worse as the print progresses, eventually the infill is so messed up that I have to cancel the print. The perimeters seem to continue to be OK. I'm using the same gcode files I sliced for the economy PETG, using the "Prusa PETG" preset in PrusaSlicer. What's going on here?

Posted : 05/01/2025 5:21 pm
trilbytim
(@trilbytim)
Active Member
Topic starter answered:
RE: Problem with Prusament PETG

P.S. First mm are OK, the problems start after quite a bit of height (maybe more than 20-30mm) has been printed, and get worse as it gets higher.

Posted : 05/01/2025 5:24 pm
Brian
(@brian-12)
Honorable Member
RE: Problem with Prusament PETG

Underextrusion.  You can see by the matte sheen on those areas that your barely extruding enough material.  That dull matte sheen comes from not getting hot enough in the nozzle.  Try raising the nozzle temp at least 10 degrees, or slow down the infill speed. 

Another alternate option is to reduce the volumetric flow rate in the filament profile. 

Out of curiosity did you use the Prusament filament profile? 

Posted : 05/01/2025 5:25 pm
FoxRun3D liked
trilbytim
(@trilbytim)
Active Member
Topic starter answered:
RE: Problem with Prusament PETG

No, I was using the "Prusa PETG" profile. Looking through them I see the the "Prusament PETG" is 10 degrees hotter than either the "Prusa PETG" or "Generic PETG" profiles (240 first layer, 250 all others for Prusament, 230 first/240  others for both the other profiles) . I've raised the nozzle temperature 10 degrees and am trying again, so far it's looking much better. So it seems that Prusament PETG has a higher melting point than other PETG's.

Posted : 05/01/2025 7:21 pm
Brian liked
trilbytim
(@trilbytim)
Active Member
Topic starter answered:
RE: Problem with Prusament PETG

I tried reslicing with the Prusament PETG profile, the higher temperature is much better, but it was still leaving some holes in the infil, so I increased the flow factor to 110%, which did the trick, it's now printing nicely. I've added the extrusion factor into the profile for when I'm using these rolls. I don't understand why it needs this tuning though, the stats on the filament checked online all look fine and the previous 'economy' filament was printing well without needing any special settings.

Posted : 11/01/2025 10:02 pm
Brian liked
TeamD3dp
(@teamd3dp)
Estimable Member
RE: Problem with Prusament PETG

I think it's fairly common to need higher than expected temps for some of the PETG+ varieties.  I use VoxelPLA PETG+ and it calls for much higher temps.  It prints really well at those higher temps and still turns matte when printed in .28 Draft on my MK4S.  That doesn't explain why their profile was off a bit for the Prusament, but the important thing is that it's easy enough to adjust and save a new profile.

-J

Posted : 12/01/2025 4:40 am
Robin_13
(@robin_13)
Reputable Member
RE: Problem with Prusament PETG

When I started 3D printing, less than 2 years ago.  One of the common recommendations is to do a calibration run with all new filament.  One calibration that I ran was a vase print for extrusion and found that on average, I needed about 7% more for all prints to get the correct wall thickness.

Also a heat tower to get the correct temperature. 

I print mainly with Prusament PETG and still have some little issues after much tweaking. 

Posted : 20/01/2025 1:10 am
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