Printing issue with a filament spool that previously gave good result
 
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Julien
(@julien-3)
Active Member
Printing issue with a filament spool that previously gave good result

Hi

I'm having problems with a spool of filament (Prusament PETG matte black). The results are not good :

 

However, prints made a few months ago had no problem.

Moreover, the same object printed the same day with another filament (Prusament PETG Jet Black) is perfect.

What could be the cause of the issue? I'm thinking of a humidity problem, although all my filaments are stored in the same place in vacuum bags.

 

Best regards,

Julien

Postato : 20/11/2023 8:24 pm
Robin_13
(@robin_13)
Reputable Member
RE: Printing issue with a filament spool that previously gave good result

Are they stored with dry desiccant?  Could still be moisture issues.  Even new filament can have moisture issues. 

Postato : 21/11/2023 1:04 am
Crab
 Crab
(@crab)
Reputable Member
RE:

What is your relative humidity in your community? If you have humidity that is over 40% all filament will absorb moisture. PLA -> PETG -> TPU (least hygroscopic to most). You can slow it down by storing inside of dry boxes or plastic that are mostly air-tight and add about 50g of desiccant per spool. My environment is near the ocean and our humidity is over 80% about 8 months a year. I regularly need to use an active filament dryer to dry spools. Even in new spools shipped into our humid area, moisture will penetrate new packaging and sometimes I actively dry new filament depending on how much stringing I see.. or other evidences of moisture.

Postato : 21/11/2023 1:21 am
Robin_13
(@robin_13)
Reputable Member
RE: Printing issue with a filament spool that previously gave good result

Also remember that RH is dependent on temperature.  So and RH of 25% at 25 degrees is higher at 20 degrees and even worse at 15 degrees which means there is more moisture that can be absorbed at those temperatures.

Postato : 21/11/2023 4:45 am
Julien
(@julien-3)
Active Member
Topic starter answered:
RE: Printing issue with a filament spool that previously gave good result

 

Posted by: @robin_13

Are they stored with dry desiccant?  Could still be moisture issues.  Even new filament can have moisture issues. 

Yes, but probably not enough. And stored in bags like these : https://www.3djake.com/3djake/vacuum-bag-set-of-5

 

Posted by: @crab

What is your relative humidity in your community? If you have humidity that is over 40% all filament will absorb moisture. PLA -> PETG -> TPU (least hygroscopic to most). You can slow it down by storing inside of dry boxes or plastic that are mostly air-tight and add about 50g of desiccant per spool. My environment is near the ocean and our humidity is over 80% about 8 months a year. I regularly need to use an active filament dryer to dry spools. Even in new spools shipped into our humid area, moisture will penetrate new packaging and sometimes I actively dry new filament depending on how much stringing I see.. or other evidences of moisture.

Usually between 40 and 50% and a temperature around 20°C

What do you use to actively dry filament ?

 

Regards,

Julien

Postato : 21/11/2023 7:46 pm
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