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Rangelus Oct 15, 2023

Help with stringing after shifting to Klipper

Help with stringing after shifting to Klipper - Lemmy NZ

Background: I am running a mostly stock flsun Super Racer, which had been running pretty well on Marlin. I was having a few problems with print quality at high speed, and in an attempt to improve this I bought the flsun Speeder Pad, flashed it with stock klipper, and got it all up and running. So far so good. I have been trying to get rid of an annoying stringing issue that I never really had on Marlin, and the more I try to remedy it, the worse it’s getting. The image is from my latest retraction tower test after re-calibrating pressure advance and rotation_distance. I’m really not sure where to go from here. Settings from the above test: - Esun PLA+ - 220C (for maximum flow) - 1000mm/s acceleration (low for a delta) - 0.1mm z-hop on retract - Firmware retract control running in test tower mode, 0mm start, 0.1mm factor - Pressure advance of 0.236 Upgrades from stock: - Lighter hotend housing - Deported fans - Fan ducts Any advice is greatly appreciated!

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GrayBackgroundMusic Oct 15, 2023

I’d call that oozing more than stringing, but they’re nearly the same issue. It’s leaking out after retracting, still some in the hot zone. I’m struggling with it too. The best mitigation I’ve found is to lower temperature.

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Rangelus

Yeah lower temps work, but I’m really trying to max out my flow rate so I want to run it as high as possible. Pressure advance really helps reduce ooze, and quality filament is obviously a must.

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woefkardoes Oct 16, 2023

Its a balancing act so if you are only upping the temperature to get higher flow but not the speeds to use that higher flow then there will be some issues. Each filament also has different temperature and flow characteristics so just because the new filament works with the current settings doesn’t mean the old filament was junk.

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Rangelus Oct 16, 2023

Hmm yes, good points. I’ll have another go with the previous filament.

To be fair, I need to replace the extruder and get a high flow nozzle anyway, which I think will make more difference to the flow rate than running hot.