Getting both stringing and underextrusion
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@Turbo said in Getting both stringing and underextrusion:
It seems like its retracting more than its de retracting, but I'm new to bowden so I'm not sure if I'm missing something blatantly obvious.
check for loose couplings
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@Phaedrux
checked. all tight with the little spacer to keep them in place -
How bout temperatures? Are you using an E3D thermistor? Do you have the correct values for it? Have you PID tuned? Have you done a temp tower? Have you tried a different filament?
Next I'd try doing a rebuilt of the Chimera.
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210c with a PID tune with a genuine e3d thermistor. never strays more than .1c.
Id do a temp tower but i know this filament is good with my other printer, which uses the same pid tune and thermistor, but is direct drive.
I have rebuilt it 3 times now in search of the problem. nothing painfully obvious -
Pinch roller tension adjustment on the titan?
Extruder motor current at 85% of rated motor max?
Extruder calibrated?
Retraction seems like it's in an ok starting point. so try tuning pressure advance now. -
Yep yep and yeah. I'll try tuning PA again, but last time it went up to about .7. Is that a familiar value with bowden?
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that's not out of reason for long Bowden's. Definitely re read the pressure advance documentation. It's been updated recently.
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@Phaedrux Pressure advance was right around .75-.8 for best results. however, this did not fix any stringing/underextrusion
I took off the nozzle to check that it wasnt doing more retraction than extrusion, and its perfect. Im at a loss here -
worn out nozzle?
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SOLVED
For some reason, a medium retraction distance and slow retraction speed works best.
I found 2.4-2.8mm of retraction at 20-25mm/s retraction speed to work best.
I have no idea why the Chimera hotend is like this, and it pretty much goes against what everything on the internet says, even E3D's recommendations, but it works! -
@Turbo said in Getting both stringing and underextrusion:
it pretty much goes against what everything on the internet says
It's not crazy if it works!
