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There are lots of causes of underextrusion. Is the Extruder motor skipping backwards? It's supposed to if there is too much pressure to avoid stripping the filament at the extruder. You can google underextrusion at this site and learn much more but here's a few ideas:

1) Loosening the 4 long bolts on the head can make a huge difference. Sometimes the bowden is just too tight against the white isolator part (you can see this without taking anything apart).

2) One of the common things that gets gradually worse is the white isolator part. Especially at higher temps (>240C). You could take that part out and slide some curved filament though it to see how much friction there is - maybe drill it out a bit. Or order a new one but this part might re-deform every 2 weeks. You can reduce the pressure on this part by having the nozzle in as low a position as possible.

3) Another thing that can get gradually worse is clogged nozzles. The atomic method doesn't always get all the gunk out. You might want to instead completely remove the part and use gas flame to convert everything in there to carbon and then do a few more cold pulls (atomic pulls).

4) As filament gets towards the end of the spool the angle that it enters the feeder gets too much. Consider putting the filament on the floor (that's what I do).

5) Some of the temp sensors are defective and read the wrong temp because of bad connection that gets slowly worse. Test your nozzle temp with PLA using the below video as a guideline...

There's 30 or so other causes of underextrusion so you might want to read about them.



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Hi again,

@gr5 thank you very much for your time and help.

Yes, the extruder is skipping, i googled a lot about underextrusion and read lot of pages here before to act.



  1. Losening Bolts - i have to try, going to check.
  2. Isolator part - I am convinced this may be a cause because i printed even at 260° for 10 hours straight and more trying to get best results from the XT material.
  3. Clogged Noozle - I didn't wanted to, but tomorrow i have to remove the noozle and the isolator to check them properly.
  4. Filament SpooI - do not think this is the cause, i get fails with every kind of spools.
  5. Sensors - do not think this is the cause the same.

While gettings results and discovering the issue i am going to post them. Any other help or suggestion is appreciated, thanks.



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