Constant PETg jams.
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Matt_Sharkey
- Posts: 347
- Joined: Mon Oct 20, 2014 3:10 pm
Re: Constant PETg jams.
If i can get the school to fund a V4 for our printer, then I'll upgrade my personal printer. I know the difference isn't big, but i'm trying to keep parity between the two printers for practical reasons.
Re: Constant PETg jams.
I can understand that ! It would however neat to have one of each and see which one you like better, and or which one gives you less trouble ? !Matt_Sharkey wrote:If i can get the school to fund a V4 for our printer, then I'll upgrade my personal printer. I know the difference isn't big, but i'm trying to keep parity between the two printers for practical reasons.
Re: Constant PETg jams.
Had exactly the same problem with transparent yellow esun petg filament. I call it spaghetti:)
Here is my investigation and results, hope it helps
- esun petg filament is threaded, I mean there is some rough surface outside (I think esun tries to make the feeder knurl gear to hold filament better) so, this threads somehow makes filament run a little hard at the beginning of ptfe pipe
- esun filament is somehow soft, like; an old toffee candy, so folding, twisting and being a spaghetti is much more easy than other petg filaments
- most importantly my filament is not 1.75mm but 1.9ish
So, the feeder feeds 100% into the nozzle, but it calculates for 1.75, as my filament is 1.9 that means more petg is pumping to nozzle but nozzle can't extrude that much so: collusion
Another thing I saw esun petg is more viscous so you need more space between nozzle and bed, if you make a paper test and think the z height is ok, you have to increase a bit, or: collusion
So, I tried everything (literally everything)
- before every print I checked filament diameter and entered to Cura
- I changed feeding coefficient from 100 to 87
- I manually modified the ptfe tube entrance (made a chamfer)
- slowed down printing speed
Results:
At the beginning 50% fail, but after modifications 15% fail
Small parts are fine, big parts somehow fail
Raft fails, without raft is somehow fine (I think first layer of the raft feeds more material)
And without changing anything, replaced the filament with 3D Printex (an eu made) and voilà! All fine, no more spaghetti
Here is my investigation and results, hope it helps
- esun petg filament is threaded, I mean there is some rough surface outside (I think esun tries to make the feeder knurl gear to hold filament better) so, this threads somehow makes filament run a little hard at the beginning of ptfe pipe
- esun filament is somehow soft, like; an old toffee candy, so folding, twisting and being a spaghetti is much more easy than other petg filaments
- most importantly my filament is not 1.75mm but 1.9ish
So, the feeder feeds 100% into the nozzle, but it calculates for 1.75, as my filament is 1.9 that means more petg is pumping to nozzle but nozzle can't extrude that much so: collusion
Another thing I saw esun petg is more viscous so you need more space between nozzle and bed, if you make a paper test and think the z height is ok, you have to increase a bit, or: collusion
So, I tried everything (literally everything)
- before every print I checked filament diameter and entered to Cura
- I changed feeding coefficient from 100 to 87
- I manually modified the ptfe tube entrance (made a chamfer)
- slowed down printing speed
Results:
At the beginning 50% fail, but after modifications 15% fail
Small parts are fine, big parts somehow fail
Raft fails, without raft is somehow fine (I think first layer of the raft feeds more material)
And without changing anything, replaced the filament with 3D Printex (an eu made) and voilà! All fine, no more spaghetti