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[Solved] PA+CF filament blocking  

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JanK
 JanK
(@jank-2)
New Member
PA+CF filament blocking

Good evening. I have Prusa MK3S, about 2 years old, which works fine. I have succesfully printed many objects using PLA, PETG, ASA, Nylon, PP, PC, FLEX... However, I have difficulties printing with the Spectrum PA6+CF15 (nylon+carbon fiber) filament. I am using the hardened steel M6 nozzle. The printing starts fine but after some time (e.g. 30  minutes), the filament is blocked and stops flowing. To unload it, I need to open the extruder and remove the filament manually, since the filament is deformed by the extruder wheels and they can no longer get a good grip. I have tried increasing the temperature, reducing the speed, increasing the flow rate, loosening and tightening the extruder screw, switching off retraction, changing the spool holder and other things but I did not succeed. The same nozzle prints fine with other filaments such as PETG. Smaller objects print fine with the same filament  (nylon+carbon). 

Any idea where the problem might be?

Jan

Posted : 08/08/2022 9:53 pm
Diem
 Diem
(@diem)
Illustrious Member

Do you have a 0.8mm nozzle to try?

Cheerio,

Posted : 09/08/2022 2:13 am
JanK
 JanK
(@jank-2)
New Member
Topic starter answered:
RE: PA+CF filament blocking

No, 0.6mm is the largest I have.

One idea I got today was that it could be because of a wet filament, although it was stored properly. I will try to dry it.

 

Jan

 

Posted : 09/08/2022 9:47 am
Diem
 Diem
(@diem)
Illustrious Member

I was assuming you were printing from a drybox, nylon is extremely hydroscopic and a couple of hours exposure is enough for trouble.

https://help.prusa3d.com/materials

The two standard fixes for a filled material clogging are a larger nozzle and try a few degrees hotter.

Cheerio,

Posted : 09/08/2022 12:28 pm
JanK
 JanK
(@jank-2)
New Member
Topic starter answered:
RE: PA+CF filament blocking

I have solved the clogging issue. I have dried the filament (overnight, at about 50 degrees C) and the print completed successfully. Good to know.

 

Jan 

Posted : 11/08/2022 6:39 am
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