Ender3 V2 - All Metal Extruder scrapes filament to grit

[ierm 0]

Hi all!

I replaced the extruder of my Ender3 V2 for a all-metal one (https://www.amazon.nl/-/en/dp/B0BZD2P44S?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1)

Since then, it looses small pieces of filament while extruding. As you can see on the picture:

 

I think it's because the filament is scraping to the upside of the holes in the metal, where it comes into the feeder and gets out. Because that's where I found the most of the 'filament snow'.  It helped to install a fillament-guide. That solved the problem where the filament comes into the feeder. But I still have this problem at the hole where the filament goes out.

 

Does anyone know that I can do to solve this?

Thanks in advance!

Edited September 29 by ierm

[Slashee_the_Cow 438]

Hiya! Just so you know, I'm moving this to the "third party products" board.

 

As for your extruder... are you sure the tension isn't waaaaaaaaaay too tight?

[ierm 0]

Hi, that's okay!

Yes. I used the adjustment screw on the extruder to change the tension, and made test-prints with different adjustments. But the problem remains...doesn't matter which tension I choose.

[Slashee_the_Cow 438]

Assuming I remember my E3V2 Neo (which came with a dual gear extruder as standard, but got killed by shoddy filament about a year ago, now I have an E3V3SE which comes with a Sprite extruder) isn't this the tension screw done up so tight the spring is starting to buckle? 

(It's entirely possible I don't remember my E3V2 Neo)

 

Did you do a retraction before taking this photo? Because there's clearly some chewed up filament before the gears:

Bite marks like that are generally a dead giveaway for either extruder tension too high or really, really, really crappy filament at normal tension.

 

1 hour ago, ierm said:

Yes. I used the adjustment screw on the extruder to change the tension, and made test-prints with different adjustments. But the problem remains...doesn't matter which tension I choose.

Try unscrewing the tension screw about as much as you can before it falls out, then getting it to extrude some filament. If it can feed the filament at all, let alone without you being able to see or hear the gears slipping, then it's definitely installed wrong.

 

Thanks for the high quality photos too (so many people provide ones so bad you can barely see a printer, let alone a problem), it's a shame this forum crushes image quality. Still gives me enough pixels to make this:

I don't mind being proven wrong (then we all learn something 🙂) but I'm 99.99% sure the problem is filament is being grabbed far too tight.

 

Unfortunately the resident older Ender-3 hardware expert (both in age of hardware and age of expert) is on a break, so he probably won't see me tag him... but just in case, hey @GregValiant, you got any blatantly obvious ideas I'm missing?

[ierm 0]

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 isn't this the tension screw done up so tight the spring is starting to buckle? 

I tried to losen it earlier, but that made my print quality worse (I was getting more missing lines in my calibration cube). 

 

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Did you do a retraction before taking this photo? Because there's clearly some chewed up filament before the gears:

No, I didn't. Could there be chewed up  filament before the gears, because the hole in the metal (where the filament comes in) 'shaves' off the filament?

 

Quote

Try unscrewing the tension screw about as much as you can before it falls out, then getting it to extrude some filament. If it can feed the filament at all, let alone without you being able to see or hear the gears slipping, then it's definitely installed wrong.

 

I completely removed the tension screw, and it indeed still extrudes. But how should I install it otherwise?
 

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I'm 99.99% sure the problem is filament is being grabbed far too tight.

Yes, I can see it on your measurement on the pictures. But what can I do about it? Because the gear and the pulley are installed at a fixed place...so I can't  increase the distance between them. 

Edited September 29 by ierm