Creality K1 TPU stringing issues | OrcaSlicer | Page 1

light path Apr 4, 2024, 9:53 PM

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Hi, does anyone have a good profile from Orca slicer?
I think I'm using the standard one, but have issues with stringing. It's not really severe unless it's TPU, but could've been better. I Think this is probably mostly about retraction, as I have tried adjusting temperatures, opening the lid during print, etc. I've tried to enable firmware retraction (on both printer.cfg and orca), but it didn't really make it better. Prints sliced with Creality slicer are pretty clean (see bottom one on the photo), but have other issues - terrible supports (with lots of wasted material) , much longer print time and more. I have tried replicating retraction/temp settings from it, but no luck.

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Creality K1 TPU stringing issues

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I've tried printing retraction test towers (this one is 0-2mm, 0.1mm step), but that did not help. Tried 0.6-0.8 retraction length in Setting Overrides for the filament profile, but it is still stringy

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I've been printing (and storing filament) in a room that is warm (28-32c) and dry (34-36%), both temp and humidity are prety stable there, I've dried the filament in a dry box as well.

soft kettle Apr 8, 2024, 10:03 PM

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I’m fighting this right now. Same dryer, eSUN tpu. Pretty sure it’s drying issue. Tried another 100% dry spool and stringing almost gone. For now I’ve picked 70C for the stringy spool, so we gonna see what’s gonna happen

light path Apr 9, 2024, 9:01 PM

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no it's not, I have my printer in a pretty dry and warm room. I've additionally dried it up in a dryer, to a rather good 22%.

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https://discord.com/channels/1154500511777693819/1225018153373929544

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long story short - it's not about retraction length or speed -what seemed to help me the most was to change the z-hop method to spiral, 0.2mm

soft kettle Apr 10, 2024, 5:49 AM

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Well, drying helped a lot, but not without some issues. I’ve tried 70C for 8 hours. First meters of filament was completely dry and no stringing at all (retraction 1mm 40/40 speed), but closer to the spool center strings are back, much less than before but anyway. So I’ve decided to run 70C for 24h just to check

light path Apr 10, 2024, 9:17 AM

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I thing you should still try some slicer settings. I've dried mine - but like I said, I print/store filament in a pretty dry room, use a filament dryer for hygroscopic filaments, store them in bags when I don't use them. What helped was adjusting retraction/z-hop settings

soft kettle Apr 11, 2024, 5:14 AM

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Looks like it’s the way. What’s your retraction settings?

soft kettle Apr 11, 2024, 8:45 AM

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I’ve tried to lower hotend temp by 10C 235 to 225, flow rate 1 to .95, retraction lengths .5 to 1.5mm, Z-hop .1 to .6 Filament is desert dry. Still stringy. Fk

soft kettle Apr 11, 2024, 9:06 AM

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Gonna swap the nozzle, extruder and reassemble whole hotend

light path Apr 11, 2024, 10:50 AM

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I have z-hop set to 0.2, but did you change the z-hop type to spiral? That is what helped me with TPU stringing

soft kettle Apr 11, 2024, 2:28 PM

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light path I have z-hop set to 0.2, but did you change the z-hop type to spiral? That is wh...

Nope I haven’t, will try, thanx

slow summit Apr 11, 2024, 8:56 PM

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soft kettle Well, drying helped a lot, but not without some issues. I’ve tried 70C for 8 hou...

Looks like outer layer of the spool is isolating inner layers from releasing mosture. Heard it is good idea to let them equalize for a while (the outer layer sucks up moisture from inner one as time goes).

light path Apr 11, 2024, 11:05 PM

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slow summit Looks like outer layer of the spool is isolating inner layers from releasing mos...

I had mine in a pretty dry environment and have been drying them in a filament dryer. Unless you're using them in a humid environment (or have left filament to seat there for too long) I don't thing that's a concern.

#Creality K1 TPU stringing issues