Ever since I’ve moved from Marlin to Klipper and then Cura to Orca I’ve had the worst stringing! If I had any hair left I’d of pulled it out by now. I’ve got a 5015 fan running at 100% to cool the hot end down so I think that rules out a cooling issue but I could be wrong! I also tried a freshly sealed real of PLA that still had bad stringing issues.
Is there anything I can put in printer.cfg to help with this?
I second that. Usually boils down to Slicer settings.
The only thing on firmware I see that can influence this is the extruder rotation distance (and perhaps improper current for the motor). Make sure it’s properly configured according to the specs of your extruder.
A way to test this is to measure 100 mm of filament from the intake and mark it. Then heat it up and call it to extruder the same 100mm. Check if the mark in the filament reaches the point you measured it from.
Thank you for the help, i’ve had a look at my pressure advance and i think its pretty good? This is a calibration square and the edges look pretty crisp?
I’ve added 2mm of wipe but haven’t noticed anything notable.
For retraction speed do you have a bench mark? I’m currently at 30mm/s
The benchmark are your tests. I would get stringing with PLA at this speed. I currently rectract 2mm at 60mm/s for PLA (at 240 C), this temperature is hotter than usual because I have a volcano hardened steel nozzle at the moment and printing at higher than 10 mm³/s.
So check your temperature, flow rate, and experiment with retraction speeds and lengths.
Edit: Quick question. Do you have a bowden extruder? If so, you will need much longer retractions (at least 6mm I would say) and 80mm/s of speed, I would say.
This is not a lot of difference so shouldn’t affect it much. I’d say is more likely a measurement error rather than incorrect rotation config. If rotation distance it was before was speced by your extruder manufacturer, I wouldn’t change it with this difference.
Its a direct drive creality sprite pro. Ive tried retraction at 2mm and 4mm, the benchys are attached and i cant notice a difference. Ive got retraction speed at 80mm/s now as well.
This is odd. It’s way too much stringing for a direct drive. I almost never use Z-hop most of the time just makes quality worse and prints slower.
What temperature are you printing? Did you change anything besides the firmware?
A few more things you can try:
Firmware retraction: You can then play with retraction parameters on the fly as the print is going.
Temperature sensor: Make sure you have configured the correct sensor and ran PID calibration.
Nozzle: Check Slicer printer setting if the nozzle size is correct
Extruder: Check if the Slicer sets acceleration for extruder movements. Try a different Slicer or a default print profile (both for filament and print settings)
Same story, same issue. Upgraded Ender 3 Pro to Klipper and switched from Cura 5.8 to Orca Slicer 2.1.
BMG Direct Drive extruder.
Other than that everything is stock.
PA is Calibrated and is 0.05.
Z hop 0,4mm before retract.
I have definitely much better surface with Orca compared with Cura. I had a lot of strange artifacts on outer surfaces with Cura. Switched to Orca and works like charm but had unlimited stringing.
Tried a lot of options and made a lot of tests
Stringing did not significantly change with retract speed. tried speeds 25mm/s to 55m/s with 10mm/s steps.
Strangely stringing did not singificantly change for retract values between 0.5mm - 2.5mm.
Tried Wipe with 0% retract before wipe, so it should retract while wiping. Had extreme stringing. Tried wipe distances from 2mm to 10mm. No use. I suspected maybe that this motion did counteract the PA calculations of Klipper.
Tried Wipe with 100% retract before wipe. Slightly better. But still a lot of stringing.
Tried no wipe. Best result but this time had some blobs. So switched to outer wall first so that retract happens in the inner wall and the blob remains. inside.
Tried Spiral Z Hop. In this case I observed that Extruder did not change Z height at all, as if Klipper could not interpret G3 command. I might be mistaken. I did not pursue this to find the issue.
So I am also curious, is this a slicer issue or slicer / klipper pa compatibility issue? With Cura stringing was spot on…
Hey @EddyMI3D, sorry I missed this point completely. Attached my klippy.log
Thre are many logs for each day of print as far as I understand. I have added the last one where I had 2mm wipe and lots of stringing. klippy.log.2024-12-17.zip (2.7 MB)
Also I made a mistake stating that my ender3 pro was totally stock:
I have Installed: Creality 8 bit Silent Main Board 1.1.5 and BLTouch (Creality pack not clone) and on top of that I have BMG Direct Drive Extruder as stated before.
