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Constant Jams  

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Sam
 Sam
(@sam-5)
Active Member
Constant Jams

When I first started printing, I could do a benchy, bulldog, my own design, etc. Happy customer of a first-time printer. Then one day the sample prusament got jammed and stopped printing. After a whole host of other learning opportunities overcome, I still have this issue. I cannot trust the printer alone: 

It will stop extruding, yet continue moving the XYZ along its merry way.

I was told to check the tightness of the idler screw (the one of the right side if facing front) by people and by the manual, but it never says what to adjust it *to* and it didn't seem to make a difference.

I unscrew the unable-to-unload filament by unscrewing the tube, moving the extruder motor forward, clipping the too-thick-for-the-tube part, heat it up to 224 and manually purging. I load filament again. I print for a while, then I'm back to jam's-ville. 

I can't get a successful print off this more than every-other. 🙁

Best Answer by NVGG Creations:

@samuelsarette

Could be you have the under extrusion issue with the hotend being too low in the assembly.  Check out the solution in the thread that g-j-sieben (above) has posted.

Respondido : 30/12/2019 9:39 pm
Sam
 Sam
(@sam-5)
Active Member
Topic starter answered:
RE: Constant Jams

Two print examples that both jammed

 

Respondido : 30/12/2019 11:20 pm
Sam
 Sam
(@sam-5)
Active Member
Topic starter answered:
RE: Constant Jams

Two print examples that both jammed

Video watching a print fail

Respondido : 30/12/2019 11:21 pm
Lichtjaeger
(@lichtjaeger)
Noble Member
RE: Constant Jams

Did you try to cold pull till it's clean?

Respondido : 30/12/2019 11:24 pm
Sam
 Sam
(@sam-5)
Active Member
Topic starter answered:
RE: Constant Jams

@lichtjaeger

Every "cold pull" instruction I read says to use ABS (don't have) or Nylon (not supported? don't have)

Guess I'm gonna have to buy some ABS?

Respondido : 30/12/2019 11:33 pm
Sam
 Sam
(@sam-5)
Active Member
Topic starter answered:
RE: Constant Jams

Ok, saw instructions that said I could do it with PETG - though i'm pulling white filament with white filament so... we'll see.

Respondido : 31/12/2019 12:06 am
Lichtjaeger
(@lichtjaeger)
Noble Member
RE: Constant Jams

No need. PLA cold pulls work pretty well.

  • Unload your filament
  • Unscrew the PTFE tube from the cool block
  • Move the Z-axis to middle height
  • Set the hot-end temperature to about 220°C
  • Push a piece of PLA filament through the hot-end
  • Set the hot-end temperature between 85°C and 90°C
  • Keep continues pressure on the filament so it can build up in the nozzle
  • If the target temperature is reached, pull the filament out (not jerky)

Some people also suggest cooling the hot-end fully down before heating it up to again to between 85°C and 90°C.

Respondido : 31/12/2019 12:17 am
Gabriel S
(@gabriel-s)
Trusted Member
RE: Constant Jams

https://forum.prusa3d.com/forum/general-discussion-announcements-and-releases/avoiding-early-prusa-mini-issues-common-issues/ might be helpful

Respondido : 31/12/2019 3:50 am
Sam y Snow me gusta
NVGG Creations
(@nvgg-creations)
Eminent Member
RE: Constant Jams

@samuelsarette

Could be you have the under extrusion issue with the hotend being too low in the assembly.  Check out the solution in the thread that g-j-sieben (above) has posted.

Respondido : 31/12/2019 11:12 am
Snow me gusta
Sam
 Sam
(@sam-5)
Active Member
Topic starter answered:
RE: Constant Jams

Yay! I did totally have the "hot end too low" issue.

The tube inside the extruder likely had a gap. Seems to be much better after following the steps from the link's reference video:

Respondido : 02/01/2020 2:11 am
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